Managers at the level of Pep and Jose have massive egos and don't give a hoot about how big most players are. They want to be in control. They want to be THE boss. Pep hardly thought twice before selling Etoo, Deco and Ronaldinho. Jose in the past, always sold any player that wanted out: KDB, Lukaku, Salah, Zlatan, etc. The problem with Jose at United right now is that he is being restrained in buying and selling and on his part, his desperation to keep the United job and succeed at it, is making him change what would have been his natural reactions. If left alone, Jose would have sold Martial and Pogba who seem to want out and bought some loyal warriors. Our board needs to make up its mind about Jose and be fully commited to that decision. Fire or keep him. If the decision is to keep him though, they need to fully back him. Let him discipline any player. Let him sell and buy whoever and let him be fully responsible for the consequences of his decisions.
This Sane example, plus the Yaya Toure example, shows that Pep is boss at City.