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.

Now that he is playing with the Clippers, they maybe not the number 1 team but they will be a great contender comes the playoffs.
I have a feeling that since LA Clippers is just sitting next to the Lakers, if both will beat their opponents, they will meet in the West Finals and then we can prove who is the better player between the two.

I can say as of now that they are even as in the NBA finals, When Lebron was still playing with the Heat, both met 2 times and they are 1-1 in win record.