Pete Carroll was a players coach and won a couple national titles (shared one because it was still the poll era). I don’t think it is has to do with being nice or mean. It has to do with holding everyone accountable and clearly defining what your expectations are. You also need to put your team in a position to win. You have to know your team’s strengths and manage their weaknesses. He need to have frank conversations with his assistants and players. And tell them how it is, it doesn’t matter if you are a senior or a freshman, the people that are showing us they are playing to the standards in practice and games will play. For the coaches, if he hears them talking up a player and they clearly are not playing to standards, he needs to set it straight. If he sees a non-starter doing the right things and the starter messing up, he needs to tell the coaches who is playing.