Whoops, didn't mean to completely spoil! D: I'm now not so sure if either of the "Ansems" that split off are from future Riku or not (despite earlier fics...) but it would seem to make sense since Riku can actually use a Keyblade. I always got the impression that people who can use Keyblades was different from "Keyblade Master," per se, but we may be totally jossed next game, who knows.