I don't mean to harp on the guy, because he is going to have a more successful life than anyone could imagine, but it appears his focus was education and long-term mental health.
When other guys (Parris, Kerk, Davison) were gym-ratting it, he was focusing on how to be successful in life. He didn't do anything wrong, he just didn't hit the weights as hard. It left him behind a bit and as he needed to rely on superior athleticism more to play catch-up with gents like them and Batista, it wore on his body more.
The guy will be fine and I do wish him the absolute best.