Kenyan Drake isn’t practicing today. He’s on the side wearing a walking boot. It’s not considered to be a big deal, but it’s a reminder that Drake isn’t as proven as most of the league’s starting running backs.

Kliff Kingsbury, per Bob McManaman of the Arizona Republic, says the Cardinals are just being cautious with Drake – that it’s not much of an injury. Drake definitely will be ready to roll in Week 1.

But Drake has never shown he can be a durable, full-time back. He’s been more of a third-down and change-of-pace guy for the bulk of his time in the public eye – both in college and in the pros.

In three-plus years with the Dolphins, Drake never ran for 650 yards in a season. After a midseason trade to Arizona last year, he ran for 643 yards in the second half of the season. That was good, productive work, but he did it for only a half of a season.

At Alabama, Drake always shared time with other talented backs. He ran for 281, 694, 112 and 408 yards in his four seasons there. While he was with the Crimson Tide, he shared the stage with four other backs who were also selected with second- or third-round picks: Eddie Lacy, T.J. Yeldon, Derrick Henry and Damien Harris.

Drake is a leaner guy, built more like a wide receiver than a running back (6-1, 211). So good chance, I’m thinking, that Chase Edmonds will have to start some games at some point. Edmonds is one of my favorite backup running backs.

It’s what Drake might do if he can stay healthy that will get him chosen before the third round in every draft. He put up 966 total yards in the second half of last year, more than all but three other running backs.

BACKS WITH 500+ YARDS IN FINAL EIGHT GAMES
PlayerRunRecTotalTD
Christian McCaffrey, Car.5066421,1486
Derrick Henry, Ten.959781,03712
Joe Mixon, Cin.8171779945
Kenyan Drake, Ariz.6433239668
Saquon Barkley, NYG6302779075
Ezekiel Elliott, Dall.6162448608
Nick Chubb, Cle.6911178082
Austin Ekeler, LAC3064867923
Miles Sanders, Phil.5242357594
Melvin Gordon, LAC5002597597
Aaron Jones, G.B.6181197378
Chris Carson, Sea.5711176884
Alvin Kamara, N.O.4242576814
Todd Gurley, LAR5021266287
Leonard Fournette, Jac.3612596202
Adrian Peterson, Was.515936084
Devin Singletary, Buff.508915991
LeVeon Bell, NYJ3742195932
Raheem Mostert, S.F.4651125778
Mark Ingram, Balt.4331225558
Phillip Lindsay, Den.519365553
Carlos Hyde, Hou.526205463
Dalvin Cook, Min.3122265384
David Montgomery, Chi.483525352
Ronald Jones, T.B.3431855283

—Ian Allan