Perhaps not. Look how many international players have excelled in SAS (Diaw, Splitter, Mills, Manu, Parker, Belinelli, Baynes, etc.). They were all exposed to different coaches, different systems, different cultures, yet so many of them excel in SAS, and many don't seem to be worth a shit before, or after SAS.
Of course, Pop is a no nonsense, my way or the highway, kind of coach, but that only works if the players believe in what you're selling. Pop has a track record that speaks for itself, but it hasn't always been that way. He had to build that up over the years and when players have seen his style of team play work elsewhere, they are more likely to instantly buy in. And, if not, he's quick to show them the door.
BNM