Bo Jackson (Who is probably one of my favorite athletes regardless of his collegiate choice handicap won the Heisman I believe...
As much as we'd all love to see Clayton win the Heisman, it'll never happen, this year or next (if he comes back) unless he starts returning kicks. History doesn't lie. Its the same reason Roy Williams won't win it this year, even though the guy's a phenom.
Charles Woodson won it as a receiver and D Back for Michigan. Clayton is a better receiver than Woodson and if he has a great year and plays a lot of defense with a lot of interceptions it could happen.
Terry Sullivan won the Heisman for the TigerEagleWarPlainsmen back in the late 50's or early 60's. I didn't really become a big Bo Jackson fan until he played for the Raiders. That run where he flattened Brian Bosworth and dragged him into the end zone was a thing of beauty.