Zach Allen considered it for a moment: What would he, if he could, tell the 2019 rookie Zach Allen who had just walked into the Cardinals' building for the first time.
"Definitely hit the weight room a lot faster," the Cardinals defensive lineman said. "Definitely do a lot more neck exercises."
A small smile comes across Allen's face. Maybe more neck exercises would've saved him from a serious neck injury that basically cost him his rookie season. The Boston College third-round pick always needed to add bulk, to go from a college end to a 3-4 end in the Cardinals' scheme.
Maybe he would have had the confidence he has now much sooner, while he's playing the best football of his career with the unknown – he is in the last year of his contract – waiting after the season.
"I wish I developed that confidence a little earlier, but at least we've gotten to where we've gotten," Allen said. "Some guys never figure that out."
The Cardinals head to Carolina Sunday without starting nose tackle Rashard Lawrence, who was playing well but suffered a hand injury that needed surgery this week. Defensive end J.J. Watt is nursing his calf issue, although defensive coordinator Vance Joseph is optimistic Watt will play.
More will fall on Allen, who week in and week out plays the most defensive line snaps for the Cardinals and did so last year despite playing with basically no ligaments in an injured ankle.
"It's night and day to his rookie year until now," said fellow defensive lineman Michael Dogbe, a training partner of Allen's since before the two were 2019 draft picks of the Cardinals. "He's somebody on our D-line we can all count on. He's a leader for us now, someone we can count on.
"He is self-motivated. He attacked the rehab process, all of them. He wants to be great."
Playing inside, Allen through three games has been charted with the second-best pass rush-win rate among all defensive tackles, behind the Rams' Aaron Donald. Donald is at 25 percent; Allen is at 19 percent, tied with the Jets' Quinnen Williams.
"It wasn't how he played or how smart he was, it was just his body," Joseph said. "He's changed his body so he's making more plays in the trenches. That's where he has to play. As a rusher, he is winning. The ball is coming out fairly fast but he's winning his one-on-ones for the most part."
The body needed muscle and girth. Allen knows that. "In college you're playing outside and you think 'Oh I'm this big, bad guy' and then you get to the NFL and you're playing more inside and you're playing against grown men," he said.
And while Allen grimaces when the idea that injuries have been an realistic excuse, he acknowledged few understood how serious his neck injury was, or how the high-ankle sprain from his second season never quite healed as needed and became a problem in 2021.
The irony is Allen had his best season last year, adding four sacks and an interception around his clear elevation to the team's top defensive lineman (thanks to Watt's shoulder injury), all while playing on a bad ankle.
"It was like, 'I'm injured -- this can't be happening,' " Allen said. "It was an ignorance-was-bliss situation but it was also like we-have-no-ligaments situation, basically playing with a broken leg."
All Allen wants to do is play the season unscathed. His contract situation? He's got an agent for that, and besides, he feels like football takes up all his time in-season to think much about next year. There is also the matter of trying to help anchor a defense that has started slow three straight games and can't afford to any longer.
The most important thing about what he tell rookie Zach Allen? Don't ride the roller coaster. Look only ahead.
"You want to Monday morning quarterback it, but we're here now," Allen said. "Now, I want to kind of prove what I can do with a clean slate."
Images of the Cardinals practicing at the Dignity Health Sports Complex before the Week 4 regular season matchup against the Carolina Panthers

Arizona Cardinals defensive lineman Antwaun Woods (92) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals offensive lineman Max Garcia (75) and Arizona Cardinals offensive lineman Sean Harlow (64) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Jonathan Ledbetter (93) and Arizona Cardinals offensive lineman D.J. Humphries (74) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Isaiah Simmons (9) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Marco Wilson (20) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals running back Eno Benjamin (26) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Chandler Wooten (50) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals running back Keaontay Ingram (30) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals Head Coach Kliff Kingsbury during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals tight end Stephen Anderson (89) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver C.J. Board (81) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals Defensive Line Coach Matt Burke during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals running back James Conner (6) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals defensive tackle Manny Jones (96) and Arizona Cardinals defensive end Jonathan Ledbetter (93) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Michael Dogbe (91) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Myjai Sanders (41) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Jesse Luketa (43) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Cameron Thomas (97) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Marco Wilson (20) and Arizona Cardinals wide receiver Andy Isabella (17) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Devon Kennard (42) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Markus Golden (44) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Dennis Gardeck (45) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Jesse Luketa (43) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals linebacker Devon Kennard (42) during practice at the Dignity Health Sports Complex on Wednesday, September 28, 2022 in Tempe, AZ.

Arizona Cardinals tight end Bernhard Seikovits (80) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals offensive lineman Kelvin Beachum (68) and Arizona Cardinals offensive lineman Badara Traore (70) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Jonathan Ledbetter (93) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Rondale Moore (4) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals running back James Conner (6) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Marquise "Hollywood" Brown (2) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals running back James Conner (6) and Arizona Cardinals cornerback Marco Wilson (20) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Christian Matthew (35) and Arizona Cardinals wide receiver Andy Isabella (17) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Marco Wilson (20) and Arizona Cardinals cornerback Nate Hairston (27) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals running back James Conner (6) and Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals Head Coach Kliff Kingsbury during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Andre Baccellia (82) and Arizona Cardinals cornerback Trayvon Mullen (21) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Byron Murphy Jr. (7) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Trey McBride (85) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Andre Baccellia (82) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals cornerback Trayvon Mullen (21) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Marquise "Hollywood" Brown (2) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Marquise "Hollywood" Brown (2) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals quarterback Kyler Murray (1), Arizona Cardinals quarterback Trace McSorley (19) and Arizona Cardinals quarterback Jarrett Guarantano (16) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Bernhard Seikovits (80) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Greg Dortch (83) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals running back Jonathan Ward (29) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Rondale Moore (4) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive tackle Leki Fotu (95)during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive tackle Leki Fotu (95)during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Zach Allen (94) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive tackle Manny Jones (96) and Arizona Cardinals defensive end Michael Dogbe (91) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Michael Dogbe (91) and Arizona Cardinals defensive end Jonathan Ledbetter (93) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals defensive end Michael Dogbe (91) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Stephen Anderson (89) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Zach Ertz (86) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Zach Ertz (86) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals offensive lineman Danny Isidora (63) and Arizona Cardinals offensive lineman Lachavious Simmons (73) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Greg Dortch (83) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Maxx Williams (87) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Marquise "Hollywood" Brown (2) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals wide receiver Marquise "Hollywood" Brown (2) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.

Arizona Cardinals tight end Trey McBride (85) during practice at the Dignity Health Sports Complex on Thursday, September 29, 2022 in Tempe, AZ.