None of the guys you mentioned were in the last 5-6 year, though. Since that first run of Cals, the recruiting has come back down and Duke has taken over.. having several classes with 2 or 3 guys in the top5. And they got nothing from it either, not even a Final 4.
Also, those ridiculous recruiting classes that Cal had from 2009 to 2015, netted us a title, a title appearance, 4 final 4s, and no first weekend exits.
The point is, just because you have elite recruiting classes, those guys are STILL freshman. And they almost never stay. This isn't college football and it's not the pros. Recruiting elite talent in college basketball comes with a very significant draw back.