Probably not. But again saying he's not a good runner is hyperbolic. I disagree that he's not hard to bring down, at times he's proven pretty difficult to bring down. Again he's not Lamar or Cam and could definitely use some improvement as a runner.
I guess I didn't see the aspect of being hard to bring down because he wasn't really an aggressive runner, imo.
It's the "type" of run that we need to identify.
If he's north/south he's incredibly fast and somewhat elusive.
But if he's moving east/west he's usually probing for a running lane and tends to not see them very well and at those times he's easily brought down. Sometimes by a shoe string even.
He'd never make a good running back for some of the same reasons he struggles at QB. I think he's way below average in his field vision. I don't think he's got great peripheral vision and he has to really see something straight head to see it and even then he's slow to react.
I think it affects his willingness to take off and run (probably why CTR called more designed run plays for him later in the year) and it also affects his short/intermediate throws because there's more traffic to sort thru.
It also might be why he loves the long ball so much. There's not nearly as much traffic to "see" and sort thru 40-50 yards downfield.
JMO.