All his life Henry was the underdog, in school and mostly in College. He was always told he wasn't good enough and always came up on top. When he finally thought, after a Pro Bowl year and playing hurt, that he found his place in the Football world, TD drafted McGahee. His first offseason as a pro the guy worked very hard and came to his sophomore year in great condition, same thing with his second offseason.
You can say the guy isn't smart or he fumbles too much but you can't say the guy doesn't like or thrive on competition. Last year the guy had a bad year, no doubt about it, but the reason is, IMO, he wasn't able to manage the whole situation mentally.
I don't like his reactions and how he approached this situation but I understand why he's doing it.