Your logic doesn't work here: From everything I have read and heard from or about JB over the years I feel like it is hugely unlikely that he promises kids starting spots on the recruiting trail. But if he did/does, then his treatment of Rak is an even bigger negative. Because now any kid he promised a starting job to could look at Rak and say "yeah, he'll start me all right, then pull me after 40 seconds and never call my name again." I don't pretend to know anything that is going on, but this is flat out preposterous, plus it prevents CJ from starting - a kid who has earned it in spades. It is almost like JB is daring Rak to blow up on him. He did say the kid needed a mean streak, maybe the whole thing has been an effort to sort of piss him off and get him aggressive. I don't know.
If it was me, (and it is NOT), I would go the other direction and tell Rak, "We're relying on you today, we are going to win or lose this game with you playing big minutes." He had to do that vs WVU and Cincy. Rak responded with his best game against Cincy.