My parents best family friends are ex-athlete megadonors of the athletic program, thus are very in the loop when it comes to M sports, particularly football and track. According to them (via email from my mom) RR is trying to convince Adam Harris of Michigan's track team to join the football team for a year and play tailback.
Apparently Adam was a pretty big time football player in high school, but chose to run track in college. He just took 4th in the NCAA's in the 60 meter dash, which makes him really fast. This doesn't make him a good football player, but it helps. I could also see him as M's version of Trindon Holliday (sp) that little speedster from LSU who was so dangerous on kick returns.
His biggest concern is that he wants to go pro in track and doesn't want to hurt himself, but RR apparently is pushing for it. He might not contribute at all, but adding a lightning fast guy to your team can never hurt.