He is going to pick up those rotations better as he gets more PT, but he does a lot of good things out there to make up for a missed rotation here and there.
But see, this is my whole point about Walker. There is no need to make excuses like this, because he took advantage of his time out there. No one needs to argue that he will pick up the rotations with more playing time, because he went out there, and was arguably the best player on the floor during the little playing time he was given.
Perhaps you are right about POB (although I highly doubt it...but I will happily give you TPs if you are), but I just don't think the C's are in a position where they can simply give someone more playing time, just hoping they will learn the defensive rotations.
This team is built on good, sound, team defense. They aren't going to make an exception about that for POB. If he simply needs more playing time, then perhaps he can go down to the NBDL. Otherwise, he needs to start stepping it up when he is out there, or else he is never going to win over Doc's trust.