Unfortunately, Logan Thomas doesn't have enough around him on offense to win the Heisman. He'll have an above average running game, an average to below average offensive line, and an average to below average WR core. He'd have to be Cam Newton part 2 to win it.
He is going to have a very tough time IMO. Recently, the Heisman has gone to a lot of players who were well known the prior season but made big statistical jumps the next season (Bradford and Leinart are the only exceptions in the past decade IMO). That bears out with the two RBs two win it as well (Bush and Ingram). They made huge statistical jumps in the season they won the award.
How does Ball improve on a season where he had almost 2000 yards rushing and almost 2300 total yards? How much can he improve on 6.3 YPC and 33 rushing TDs? He's going to have to be in Barry Sanders territory to get the Heisman IMO. That or another season when like when Tebow won where no one on a top team is a star.