I could not care less who stays and who goes.
The problem with Ollie was Ollie, but part of that is the character/work ethic of kids he was bringing in. I'm not convinced Vance wasn't a problem, no matter who was coaching. Other than Kwintin, who was benched regularly after major effort games, who stood out as being that guy JC always looked for who would have your back in a fight and never back down? Maybe Vital? After that?
Was Ollie too palsy/walsy and "we all fam"? Did it lead to him be soft on the kids? Not have the authority to make them play harder? Bench a kid who needed benching? Were some softer kids drawn to that? You do your campus visit and the other players tell you, "Kev a great dude. He's not going to make you work to hard in practice." Sounds good? To some players.
I remember the first time I saw a video of Kemba - HS game. Guy was all over the place. Constant effort. Never backed down, never stopped. That's a JC kid. Probably a Hurley kid too, I hope. Would KO have appealed to Kemba? Maybe guys like Donny Marshall and Kemba and Caronimo were drawn to a domineering, overbearing, but deeply loving father figure.
Far as I'm concerned, Dan Hurley should tell each and every one of them individually that there's a new sheriff in town, and it's his way or G T F O. I'd rather play with 5 walk ons who will go Blls to the Wll and not win a game than watch another season of putrid effort, stilted offense, and uncaring defense.
A similar transition occurred when JC showed up. Cliffy went up to him and said, "hey Jim." JC said, "don't call me Jim. You can call me Coach or Mr. Calhoun, but not Jim." Cliffy said to himself, "things are goin to be different." One losing season and then 4 NCs later . . . .
The Coach is dead, long live the Coach.