I've said it before, I'll say it again. Kingdom Hearts without Disney is a husk. Including Sora without anything from Disney just feels wrong and antithesis to the series. Now, Sakurai may be okay with bending the rules for background, moveset, or AT characters so I'm not saying Sora would be a bad pick. Just, to represent him properly, you need that stuff.
And I'm sure Sakurai knows this, too, so. Don't get your hopes up unless you're okay with Donald and Goofy in a FS or something.
Anyway, I trust Emily above all these other people, so it does seem like the Grinch leak is fake, so now I wanna know- how'd they do it? Such skill for a fake with very minor inconsistencies that are easily explained away is nothing to snort at.