In my opinion, Coach's worst problem is that he felt that he could coach anyone up, at least anyone who was willing to be coached. He still sort of thinks this --- I recall a sideline incident this year when a high-talent LSU receiver came off the field after screwing up, and Kelly was loudly (elbow-grabbing-and-turning) in his face yelling "Who do you think you are? You're uncoachable!!!"
In my opinion (again) he is not very good at judging character in many "kids", and for other players is not very good at judging that some even nice diligent fellows don't have what it takes upstairs to handle the way he wants to play football. This is why, again my opinion, we actually got better (more dangerous) once he decided to step away from on-the-sidelines play calling, nor too much "interference" with coordinators planning, nor, probably, some aspects of the recruiting.
I would like to sit and talk with him about the moment(s) when it dawned on him that his "old" style of football strategy and player management no longer ensured that he could win it all at the level he needed to, and he needed to retreat into the "grand system creator and administrator" that he could still do at highest levels. The must have been a big ego deflator or at least a feeling that his "days of pure football" were lost. I also wonder why he didn't decide to go to the NFL then, other than some of those guys are even less coachable than the "kids."
Most here just want to throw cheap shots at him rather than actually discuss him, so I realize that this is an unwelcome post.