Pretty fair critique....
1. Cal had some major talent that he could draw (until Duke jumped into 1 and done)
2. But Cal, to me, can develop players when he tried to. If he could get guys to stay for a few years....they were better. PJ Washington jump in year 2, Nick Richards, Derek Willis was a good stretch 4, etc... It's just that he got so enamored with getting guys out to NBA so fast and getting the next 5 star kid that overrecruited current kids...he failed to keep some that needed an extra year (Diallo, Keldon Johnson, etc..)
3. Cal's defensive strategy with the athletes was really good when he got it dialed in. Athletes, switching on ball screens, funnel to shot blockers, etc.... But once the talent level dropped (i.e. Duke jumping into 1 and done pond)...>Cal's coaching of hedging ball screens, trap ball screens, cheat back into lane on drive and kick, etc... got worse and worse.
4. And finally....and biggest issue....he lost Robich, who was the main teacher of concepts. And guys like Welsh was a good offensive uptick, but Payne, Bruiser, Barbee, etc....were just way less teachers than Robich.