It won't speed up the process, but if KK can't develop him, we need someone who can. He might be set back slightly at first, but the greater developmental gains would far outweigh that. This is based on my opinion that KK can't get the best out of KM. Someone needs to be able to get through to him that he can't just rely on his vaunted "cognitive ability" and has to put in all of the work, that he has to change certain aspects of his game. I don't think KK can effectively criticize him, constructively, and prod him to be better. If he could, we wouldn't see constant repeats of stupid mistakes.