Yeah, it looks like Hughes has prioritized culture almost as much as talent. He's giving these kids a home base and sense of belonging, which motivates them to think as a unit.
As fans, we forget how young these players are. Yeah, they're making big money, but they're still away from their parents, siblings and friends, in a new city with no one to bond with except each other. That's one of the reasons so many millionaire athletes marry so young – the need to create a family in place of the one they left behind. The organization has a responsibility to act as a proxy parent, but taking on that role can also be an opportunity to cement loyalty. Hughes is a parent and a longtime agent; he understands how young adults think. As you said, by showing the kids he's committed to them, they're happy to commit to the team.