Come on man, they are professionals of course they know their roles in the team and that would make them grow as a team and as a teammate.
There are also other professionals who doesn't follow their rule, they want to lead a team and they want to be called as the main man, but PG is different because he was very effective playing in the OKC before and its only westbrook who had a very bad season.
I can only think of one NBA player that looks like does not know how to cooperate with his teammate, and I believe its Carmelo Anthony which was a star but until now he was not signed in any team yet.
PG is not someone that a kind of player who takes the game without concerning about the teams goals. I mean this guys we're talking about want to win championship and all he needs to do is to cooperate with his teammates.
He hasn't won an MVP award yet but we know he plays like an MVP, when he is needed he always perform like what he did during his time with the Pacers if you still remember. I believe he was not the main man back then but he develop to become a star in the team.