The guy nobody's mentioning, and I guess I understand it because it's sort of out of left field, is Quinton Flowers.
I've been following the kid since high school. He's not destined to be a quarterback. You don't need to watch him throw very many passes to come to that assessment. He struggles to be "within the neighborhood" accurate on even the most basic throws. He's not built for the consistent mechanics you need at the position.
But as far as pure make you miss, juking, ball carrying, run to daylight, be an athlete type guys go...I haven't seen a guy with this sort of pure elusiveness, patience, speed, feet, and vision at the QB position since probably Mike Vick. I've seen some guys that are pretty elusive, but I do think this is the most impressive guy I've seen that way since Vick. There's a reason Alabama recruited him and it wasn't to play quarterback. I don't know if they intended him for RB because I don't know the inner workings of that program, and Flowers was a safety of some note back in high school playing both sides of the ball. But I think he's done so much ball carrying work at South Florida that it's moot. That's the position he should shoot for in the NFL, IMO.
The ability to become a complete back, to block well and to be able to catch the football, these are things you can't know about him. But if you start with the fact he's the team leader, hard worker, solid build, and you figure in that a quarterback generally has a lot on his plate in terms of understanding play design, how every player fits into the play design, etc...you could do a lot worse. Immediately, he should be an excellent punt returner.
As a RB, he's like a Dalvin Cook. As a QB, he's like a Dalvin Cook.