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.
I know that Lowry is the captain ball of the team, but they usually give the ball to Leonard in crucial times and it seems like it's Leonard is already manning the ball most of the time. Just like Kobe Bryant role, he is not the PG of the team but once he has the ball, he can decide to shoot it or to pass it. We may have different point of view, I respect your opinion but that is my opinion too. What you see is correct but what others see is, just because a player is the main scorer, that becomes a leader which is not, also depends on the team. Leonard is just doing his job because of the role he was assigned to.
For example, I'm a leader of the team, I saw someone in the team is capable of taking the most offense and clutch shot, therefore I will assign him to do it. That's the case on the Raptors. Leonard is not the leader of the Raptors but just following the system. That was the best part of him as he proved he can do it. He leads the team in all aspects. Siakam and VanFleet also did a great job in playing the role they were assigned to that's why Raptors achieved their first championship.
In the case of Kobe Bryant you used as an example, he is the leader on the Lakers while at the same time the main scorer. Totally different from the Raptors.
Don't worry all opinions here are respected as long as no one will use a word that crosses the borderline or foul words.
I think any leader of the team will an easy if he has Leonard playing with him, last season when Raptors won their championship, Lowry's averaged on points has dropped but in the assist department, it has improved a bit, that only says that they have a good system.
his stats https://www.basketball-reference.com/players/l/lowryky01.html
The thing is, whoever is the team leader of a certain team, if he is not scoring well, he will not be popular and people will believe that the leader are the one who are making most of the shots, that is why players who have good offense are more recognize than those players who are good in rebounds and blocks as basketball is a game of offense.