The Heisman this year can go to a number of individuals. There are three, maybe four, legit QB's who ALL are serious contenders for the trophy this year. The thing we are missing is the supporting cast. Look at the past couple of winners. Winston and Manziel had some AMAZING WR's that dominated. Yes, they had to get them the ball but these athletes also went above and beyond to help their QB's numbers. So, I think it comes down to who's skill position players step up.
Braxton has the best chance to do it himself (running wise) w/o relying in WR's. He can't win it with rushing alone, but he can keep himself in contention more than any of the otheres. It's going to come down to the supporting cast of the people around these QB's. Winston, he lost too many major offensive threats. He has one good WR and I don't see any of those backups helping out (dominating) just yet. Mariota doesn't have it him (in my eyes) to take over when he's facing a GREAT defensive team. His games are usually blow outs or offensive slug fests, with little defensive pressure. After playing in these games all season, its hard to just "turn it on" in the 11th or 12th game. I feel that Braxton has the best chance as he will have a great defensive (at least the front 7 that we know of right now) and WR's that have been in the system for awhile. Combine that with the influx of new, FAST talented freshmen and look out. Only item of concern is if he gets banged up early in the season due to an inexperienced line. Hope they learn quick!!