A simple understanding of our system, players comments, and common sense (to me) are enough to understand Cal does "push players out" or in lighter terms, "needs them to leave". I don't honestly see how that is some hard concept to accept when it's the only way He's able to do what he's able to do. You can't manage this system if players consistently return. And that's especially now, considering top 10 prospects will go anywhere. He can't scare them off. That's why he needed Bam to leave, because Bamba was "in the bag". IN 2009 he would have been.
To not accept this is to suggest that every coach in America can get guys to return, but Cal, the greatest salesman the game has ever seen, can't. Maybe it's Roys box of rings, or coach K's nose? Let's be real. He could.
Not an opinion on the idea itself, just that it does happen, and I once believed the opposite.