You dont say...
Let me look at his pre-draft scouting report
Weaknesses: Filed under “it is what it is,” we find McCaffrey’s build. He may add some muscle once he hits an NFL weight program, as rookie are wont to do, but his frame’s already pretty well cut. He is not built to be a prototypical 230-lb., bell-cow back. Granted, that did not stop him from carrying a heavy workload at Stanford, but the 672 combined offensive touches he had in 2015–16 might work against him, too—that’s a lot of tread off the tires for a back, and he missed games to injury.