The only thing our leak was really "flat out wrong" on was Chrom and reveal times. And the Chrom thing could have been easily mistaken for "Fire Emblem: Awakening Protagonist" or having seen Chrom's in-game model, etc. I dunno, the leaker hasn't spoken to me since just before the Lucina and Robin reveal.
Also, people need to stop attributing the leak to lucky guesses, or "extremely obvious choices." That's so easy to say in hindsight, but in reality, they weren't. Wii Fit Trainer, Mega Man, and Villager, each by themselves were stretches. The fact that the leak had and got all three, in addition to seven others---they weren't lucky guesses.
I, too, want to know the fate of the Chorus Men, though. Have the early buyers unlocked every character yet?
Mega Man, Pac-Man, Miis, Little Mac, Palutena, Chrom, and Shulk were all on my "shocked if they don't make it" list, even before E3 2013. I don't have enough confidence or bravado to say that I'm a genius at predicting the roster, and I have enough experience in the fan community to know that Pac-Man and Miis were the only heavily contested additions in that group.
He was wrong about Chrom, wrong about the announcement date for three characters, and as far as we can tell, he was wrong about Chorus Kids. I'm much more willing to accept Wii Fit Trainer as a lucky guess than I am to accept all of those inaccuracies as unfortunate changes of plan.
There are hundreds of wannabe "leakers" out there before any Smash game is released, and plenty of them make outlandish claims to make themselves both stand out from the crowd, and seem more reliable if their guess proves correct. It's not surprising in the least that one of them out there would get it right and try to capitalize on that success, despite being off-target about a number of other facts.
If the Chorus Kids are playable, I'll happily concede. Until the Gematsu leak, they were even more obscure and outlandish than the Wii Fit Trainer. If he's right about both of those characters, that's far too spectacular to be luck. But if he's wrong about Chorus Kids, that's just one more mark on his list of inaccurate claims.