I can't remember all of them but there were some viable reasons why some of the favorites didn't win.
If I'm not mistaken, isn't AJ the one that had to drop out due to a pretty bad foot injury? Isn't he the one Bill DeMott kept calling a Donny Osmond lookalike? If it's the guy I'm thinking of, he did show some real promise but, hey, what can you do. He got hurt and had to quit.
Jeremiah was someone that had a lot of guts but no common sense. He took a ton of risks without considering the consequences to himself or whomever he might be wrestling. He even said so in the various confessional style interviews that all the contestants gave that he just went out and did it. He threw caution to the wind and it seemed like he didn't care if he got hurt or not, or even if he hurt someone else. There's a difference between being brave and being stupid. Jeremiah might've seemed gutsy but, to me, he came off as a guy that seemed like he didn't give a shit whether he or whomever he worked with walked out of the ring ok or not. He has slammed WWE several times afterward and I think it really shows his real character. There are any number of viable reasons not to want some reckless hick as part of the roster.
Luke was a guy that did seem to have it all in terms of a good look, solid charisma & athleticism. The only thing that really hurt the guy was that he definitely had something of an immature attitude. He came off like a little bitch whenever something went down on the show that didn't happen to go his way. To me, Luke came off as a guy that thought he would just waltz in there and Stone Cold & the other trainers would just drop to their knees and praise him as the next wrestling god. I think Luke was good but, all in all, he wasn't as good as he thought he was, the trainers let him know that and he'd whine about it afterward.