I doubt the part with every single thing correct is just a lucky guess.
Wii Fit Trainer, Megaman, PacMan, Villager, Little Mac, and Mii Fighter -- no way are all of those at once just lucky guesses.
pacman was obvious since namco is the developer,megaman was already predicted for brawl,same goes for little mac and mii,both already strong candidates since brawl...villager and wii fit trainer are the "main characters" from two of the most profitable new "series" nintendo had.
also,not every single thing was correct,since he didn't guess rosalina,chrom is not a newcomer and robin was not even mentioned in the leak
it was well made,i admit that,but everything he got until now could be guessed with a little of thought and luck.
i would change immediately idea if something like the chorus trio is announced,but until now what wasn't announced are the most hard to get