I think any long time fan can answer this. They lack the fight that JC teams had. Who are the guys that are going to "impose their will" on the game. A phrase JC used constantly. Where are the men amongst boys? RP could be that guy in spurts offensively. Adams at times when 100% and not trying to force too much.
The guys that left early and failed are just more examples of this. Bazz, Boat, Kemba, Caron, the Marshalls, Ollie, Shef, even Thabeet, Boone, and Armstrong all played with an edge. Facey in the 2nd half of the season played with an edge and would definitely be that guy if he had another year. Brimah never had it and clogged up a spot waiting for him to develop but that wasn't all on him. Daniels and Hamilton passed on the challenge and though 20 minutes of solid play was enough to turn pro. All had holed in their game. The defensive liabilities were on full display yesterday. If KO is going to be a worth successor, then the guys that got bigger minutes this year and those who were hurt need to become those fighters and assassins that will make it hard on opponents for 40 minutes every night. So much of it is mental. The mental errors yesterday have been there all season and came from the upperclassmen more often than not.