I don’t follow WBB at all, but yes, Purdue was bad, and it’s not uncommon for players, particularly those that are highly rated, to blame the coach versus looking at their own role in the team failure.
I don’t know that they all need to end up at the same school, but you know how this goes, sometimes when a family feels alienated from a school, their options become ‘anywhere else’.
My understanding is that Kinney is the guy, and really likes Coach Painter and Purdue, but will have big bags of money awaiting him at other destinations that may be hard to turn down.