Robert Nkemdiche may not officially be a starter on the depth chart, but the way the Cardinals' defensive line rotation is going to work, he'll likely work as much as those on the field first. Coach Bruce Arians said he will likely dress six defensive linemen on game days this season, and it'll be a rotation -- probably moreso than when Pro Bowler Calais Campbell was there to eat up a lot of snaps. Nkemdiche, who has had a very good camp, is showing he should be near the front of the line.

"He's playing with the ones a lot now," Arians said Thursday.

Nkemdiche got a chance to take a rep against first-team guard Evan Boehm in one-on-ones Wednesday, and bested Boehm. Nkemdiche remains modest in how he talks about where he is as a player, but the head-down-full-speed approach has been working.

-- Arians likes the improvement from all along the defensive line. One guy that seems to be an underrated lock to be in the rotation is Olsen Pierre, whom Arians continues to compliment.

-- Two receivers, Chad Williams (shin splints) and John Brown (quad) are questionable to play Saturday. T D.J. Humphries (hamstring) is also a game-day decision, although Arians said if there is any question Saturday, he'll sit.

-- Arians said he's looking for the wide receivers to get much better. "That's the group that really needs to pick it up," he said. Injuries have slowed the unit, but Arians had said Williams in particular had been disappointing before he was sidelined.

-- Finally, a dose of Ironhead. Undrafted rookie safety Ironhead Gallon, besides having the best name on the team, had been impressing Arians. At least up until he hurt his knee in practice.

"He's bright and tough," Arians said. "He's one-legged right now. He is finding a niche for himself."

Arians said he actually coached the man Gallon is nicknamed after, one-time running back Ironhead Heyward. "It's a lot smaller Ironhead," Arians deadpanned.