Like any agent worth his commission, Aaron Turner is his client’s biggest cheerleader, as he is first among those who believe Warriors forward Jonathan Kuminga is a starting role away from becoming a perennial NBA All-Star.Maybe he is, but that’s not happening in Golden State. Not as long as the core trio – Stephen Curry, Draymond Green and Jimmy Butler – remains intact. And if there’s no room for Kuminga in the starting lineup, he can’t be the player he wants to be.“It’s probably true,” Turner said Friday during a guest appearance on “Dubs Talk.” “But that doesn’t mean that it can’t work, or it’s not OK for the time being. JK’s an ambitious 22-year-old. I’m not going to take that away from him. I love that. He should be. (He’s) young. You want to keep growing and get better.“The way JK moves is he wants to keep pushing the envelope, and I’m not going to take that away from him. I actually agree with it. Can he be the player he wants to be here, right now, with this roster composition? No. But that doesn’t mean he doesn’t want to win and...