I think the reality of the Jets/Tebow situation is starting to come out. Tannenbaum and Ryan were getting into it late last season. So when Tb decided he wanted Tim, Tim unknowingly walked into a GM/HC pissing match that Rex decided he wasn't going to lose no matter what. Once the season was over, it was clear either the GM or Rex had to go, and Rex won out.
Really unfortunate that Tim picked the Jets, but going in that would've been tough to predict. Had he picked Jax, it's 90% likely he would've had another shot this year.