We don't exactly know how the leaker knew what the characters were. Maybe he just saw the 6 characters mentioned, and not any others.
Besides, it's not like its some fan rumor that some random guy posted on a forum. A respected journalist got it from a previously used source, and he posted it on Neogaf, not expecting the leak to be true. It would have to be an insanely improbable coincidence for someone to have give a false rumor to a journalist that turns out to be 60% true (so far).
If they use an older design, like this, I could get behind his inclusion. But I agree that his newer look is quite hideous.