Can't look at your stats
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Not sure about the details of the leaderboards... be sure you play ranked matches in order to end up in it. As far as my experience goes they update quite fast.
In the leaderboards you can see the amount of kills (the plane icon), amount of points (star icon), and I believe games played (controller icon). I'm pretty sure I've missed one, but I'm too lazy to look it up at the moment. I'll get back to it as soon as I see it.