I still think that the rest of Gematsu's leak will come true (Shulk/Chorus Men). Him being wrong about one character doesn't automatically mean that he's a fraud and that none of the info was ever legit. The leak is partially real, I think it's foolish to say otherwise at this point, it's just that his info is not as 100% as we've been taking it.
Yep.
He is probably not someone very important during development, translator for example.
Development in games change all the time.
Is obvious Sakurai knows about the leaks and he is acting accordingly. Im pretty sure he told people at Monolith to retweet just so he could make a huge surprise. The Chrom fakeout was done in the trailer exactly for that.
This is done all the time in other media (misleading script titles, recording altarnate scenes so people can't leak, etc...), its not surprise Sakurai is using this tactic against the leak. No creator likes he things leaked before time.
The leaker knows things, but he doesnt know all and things like Chrom can be explained perfectly. And thank god for that, I think this is the more beneficial troll Sakurai has ever done to keep people excited.