Let's look at coaches. What's a bigger culprit for Cal regressing on the court: Mike Montgomery's inability to recruit with their on-court success, or Cuonzo Martin's inability to max the talent of the players he's got?
With the team in decline, Monty jumped ship and left Martin with a pretty bare cupboard with which to install his new offense. It's a tough situation for Cuonzo, who did his most to get some big wins but just doesn't have the bodies. He particularly needs a primary ball handler and a big. If he gets those, Cal is in better shape.