He is not the team leader on Spurs, Raptors, and Clippers but just doing his role. Kawhi is still young and he can beat the hell out of records out there, not just against Lebron but to other superstars as well.
I beg to disagree on this, Leonard might not be a Team leader on Spurs as he played most of his rookie years with the Spurs but he got his first championship with the spurs and his first Finals MVP, that says a lot to me, the only reason we don't see his leadership because he is a humble player in the court, he doesn't talk a lot, he is more action than words.
However, with the Raptors and the Clippers, I think I saw his leadership, if you saw how he played last playoffs and NBA finals, you'll see that he is the main man in the team and he is good in getting his teammates involve so they have success together.
You might have the wrong impression of being the main man, it's not always the leader. In Raptor's case, that's not the case. The one who is making plays for them is Kyle Lowry and he is the leader, not Kawhi. Since Kawhi is the main scorer, therefore Lowry will put the center of offense to him. Kawhi is not a leader but he is just doing his job to the role assigned to him. Raptors trusted him.
Another example, Steve Nash. He is the leader way back in Suns but the center of the offense goes to Amare Stoudamire. Jason Kidd is also a leader on Nets but the center of offense came from Kenyon Martin, Richard Jefferson, and back when Vince Carter back when he is teamed up with him. Chauncey Billups of Detroit but the offense mostly came from Hamilton and Prince. There are lots of examples out there.