Forget who stays or goes.. The most important returning factor is this coaching staff who need just as much improvement as any player on this team.
I know you know your stuff but there is no coaching staff anywhere in any sport anytime that is more important than having players. Wooden, Knight, Coach K, Jay Wright name whoever you want they could not and do/did not win with less than very talented players. They also did not win until they gained at least some reasonable amount of time to build a program and get those level players.
I never said that a coach was more important than a player nor do i think that is the case.. However those people you refer to in your post are and were great coaches and ours is a great player in a suit as of now. My point was that if there is any one place for emphasis on improvement then it should be with the coaching staff and not with the way a returning bench player ( Amar) spends his summer improving.
Last season the coaching staff, like the players, went through an acclamation process with one another. There was, and will continue to be, a learning curve for them. There were times where there seemed to be a lack of cohesiveness. The post season drama with Slice lends further credence to that notion, and that the staff needs to work through some things and come back next year on the same page and with defined rolls. I like what they've done so far on he recruiting front, but the jury is still out on staff management and in game coaching. Your point that the they need to work on improving over the summer is a valid one.