He really doesn't need a nerf, nor does anyone really. The game is still forming ways to beat certain gameplays, and currently those characters are being played by the better guys in the game. That doesnt mean that other characters are going to emerge as very good. There are still other characters out there that are fantastic. And I'll bet on those leaderboards those top guys could play 4 or 5 characters and still be black belt... just because one is most used doesnt mean that there isnt a second close behind, or even more.