In my personal opinion, and trust me, I NEVER do this (but hey, never say never) but I believe it is entirely rational to blindly accept the Leaky 3. You can assert that you predicted those all you want, one might question your sanity, but that is your prerogative. Wii Fit Trainer was rarely associated with her game (she was never alluded to in a character-esque context), no one really speculates about Smash from a sales perspective and no one thought that Sakurai would implement the antithesis of Yoga into her move-set. As for Villager, many believed he was de-confirmed utilizing Sakurai's very own criteria. So it would have been blatantly ridiculous to speculate for Villager. As for Mega Man, that is entirely dependent on the licensing, a lot of people saw him coming, that doesn't alter the notion that it was not guaranteed.
If someone, who's intent was to incite me to accept their leak, speculated for Wii Fit Trainer, using the correct name (it could have been Ms. Fit, or Wii Fit Lady, or Wii Fit Girl, or anything really) I am inclined to agree with them. The premise that they also correctly assessed Villagers chance doesn't attenuate my faith in the leak. Lastly, it isn't like the leak is proclaiming something entirely absurd. In fact, the latter half of the leak are the "safe" characters. I mean, wasn't it announced that Namco Bandai was co-developing the game prior to Smash? If not, Pac-Man is another bold prediction, if so, whatever. Little Mac was alluded to via stage reveal as it was.