When you have arguably the best running back in the league -- certainly in the top two or three -- who can both rush and catch the ball with any back out there, the notion of who is behind him can get lost. But then it was reported this week, before LeGarrette Blount signed with the Eagles, that the Cardinals showed some interest. It raises the question, with the team moving on from veteran Chris Johnson and Andre Ellington giving wide receiver a shot, just how that depth chart will fill out behind David Johnson.

As it stands right now, Kerwynn Williams figures to be the top running option behind Johnson. Williams has earned that nod over the years; he has produced on the ground when he has gotten the chance. T.J. Logan, the rookie fifth-round pick, is a virtual lock to make the roster. His kickoff return skills alone help, and from what little I have seen in the OTAs and rookie minicamp, the speed on display after catch a short pass is a very real threat.

Beyond that? Ellington could still officially end up as a running back, although it feels like in many ways his and Logan's skillsets are similar. Big Elijhaa Penny seems to be the wild card. Is he the big back the Cards could use between the tackles if needed? Do the Cardinals need to add someone at some point? I've never gotten the sense the Cardinals felt a strong need to add another vet back -- it was a little surprising to hear Blount caught their attention -- but that's part of what OTAs and minicamp will be for, to sort that need out. It would never be surprising to have the Cardinals decide to make a late signing either. That's what happened with Chris Johnson, and with GM Steve Keim, you never rule out that possibility.