Of the RB list, strongly prefer Tre Bradford and his sprinter speed to go the distance that scares the heck out of a defense. Teague has pure speed but Crowley and Chambers are more chain mover types even though Crowley can break off long runs.
Marcus Hooker, imo, should be a RB/H-Back, not a safety. Marcus was a tremendous playmaker in HS on the offensive side of the ball and that is being wasted at safety. The Buckeyes have recruited the safety position well and could afford to move him over to offense.