I wanted to address the entire thing and put this to rest, so here is a good time to do it. I warn you, this will be long.
You mention that the main pillar of this leak is that is was unlikely for anyone to guess Wii Fit Trainer or the characters in general. As I mentioned before, the leak is built on the idea that it has to be more than just a coincidence and he had to know something. This is actually called the Texas Sharpshooter Fallacy. Take a cowboy who shoots at a barn. He shoots randomly at the barn. He then looks at his gun shots and notices that they all cluster around one spot. He then draws a bullseye around one spot. This makes him look like he is a pretty good shot despite the fact he shot randomly. The fallacy is when you see randomness and mistake it for order and reason. And conclusion is drawn from that. This scenario is exactly the same. So everyone is on the same page, let me explain the situation. A poster on NeoGAF, before the game was announced said he had some "My unlikely predictions" and he listed "Little Mac, Pac-Man, Animal Crossing Guy, Mega Man, Wii Fit Trainer, Mii." Well, come the next day, three of these characters are revealed. He then post on his website that he had an inside source and that the other three would be revealed at E3. It should be noted that the website never said they had an inside source until
after Wii Fit Trainer was revealed. What does this sound like. It sounds like drawing a bullseye around the gunshots. And everyone who believes it has taken the same approach. To go further with the fallacy, it can apply to situations where there is no relation but because some unrelated pattern, it seems like it's more than coincidence.
You can find more about it here. I'll post an example from the article to further illustrate the fallacy.
"But hold on Chu. What about the fact he got Wii Fit Trainer and Villager right." That's a good point, but remember this fallacy is about finding order where there is none. So consider this: Melee sold over 7 million copies and Brawl sold over 11 million copies. The highest traffic of the Smash Bros DOJO was over 7 millions uses (
see here, since the site is now gone). So there are a lot of people talking about the game. This also means a lot of people are making roster predictions. Also, people don't just say one or two characters. They can be long list at times. So it's likely that, with only three characters announced, that someone would get a few of them. There is also the possibility of someone else out there got those three right too, "But Wii Fit Trainer. No one talked about her." That's not true. We know it was brought up at
least once, so it's not outside the realm of possibilities. One thing to also consider is that it seems unlikely to who you are talking too. Many people here thought Villager couldn't happen because they thought Sakurai ruled those characters out. But to someone who didn't know that, it would seem plausible. Both Wii Fit and Animal Crossing are big series for Nintendo, so something from these games is very possible. Again, the Texas Sharpshooter Fallacy is when you see order from randomness. So the leak seems like drawing a bullseye. You got some right, so the rest might be right too.
You mention that no one has brought any contradictory evidence for the leaks. By saying that, it's clear you haven't been paying attention. There is plenty of evidence to suggest it's baloney, so let me go over some of that with you.
It's important to look at this and compare it to other leaks. What makes this suspicious is the amount of info that was given. Consider ChaosZero's leak. You can find what he wrote
here. What he did was mention something like the "Dragoon Parts." He described what the item did. Later one, this item was shown on the DOJO. His leak was proven right as he pointed to something that was in the game. Another one is NyaseNya. She predicted when Sonic would be announced and that the game was delayed. By proving this, it confirmed she was right. Admittedly
, people still didn't believe it since both of those events were not specific. A leak for Marvel vs Capcom 3 revealed the characters include the mechanics for Phoenix. "But Chu. How is that any different then the leak we are talking about now." ChaosZero and others stated they knew something, gave a very specific example, and then when that was shown to be true, the rest came along with it. For the leak we are talking about, the poster made a prediction, and when some of it was right, he claimed he had a leak. ChaosZero hit a bullseye. Salromano drew a bullseye.
This is one reason I harp on the fact that I harp on Villager's name. Were Salromano have inside information about the characters wouldn't he know the characters name? Lets take this a step further. The others leakers had specific information which, when confirmed, confirmed that rest of it. Yet his information was very limited. So how would someone go about getting this kind of info. The leaks came from people who had access to the game, such as tester. This is why the leaks came towards the end. Right now, very few people know the roster. Most of those people would be in Japan and wouldn't care to give information to a western fan site, especially a small and forgettable one. So how did he get the info, or how did his source get it. Well, let's assume the person telling him this saw the trailer. If that was the case, how come he only knew the characters names? And even more so, how did he get one wrong and they are plastered across the screen. This person would have seen stages, attacks, and the like. So he would have known more than just characters names. He would have also had to see a lot as the characters were in three trailers, not one, and Megaman's showed off a ton of attacks. If the person was part of E3, then how woul;d he know about the other three characters. The decision to show the characters had to be made far in advance and by the time they were setting up E3 it would have been finalized what was shown there. If it was someone making the game, they would have known specific attacks for the characters and even more than someone who is working with E3. There is also, as I mentioned before, very few English speakers who would have information as the development is all in Japan. This is why I say that someone working on E3 would be likely, but even then, why do we not have more information. Especially if they wanted this information to be believable. Again, it's drawing the bullseye. On the same note, it's why the rumor was debunked when the characters weren't at E3. Again, he said the characters were all part of the E3 reveal. After they weren't shown, he made a post explaining himself. It sounds like he is trying to make sure no one notices the wet paint.
Before I wrap this up, let me talk a little about Pac-Man. People expect this character because Namco is making the game. But Namco is also making Wii Sports Club. So just because Namco is a making it doesn't mean Namco characters will be in. Sakurai has since confirmed this saying that Namco characters wont get in just because they are making the game. He stated further that in order to be added, it would have to be a special situation. You can see what he said here. Namco has asserted that they aren't getting involved with the character selection. The Tekken producer has held back as far as any characters. See here. On Tales characters, the Tales producer is taking the same route. It all points to Sakurai have his own say. So it's unlikely Pac-man ins't going to be pushed in just because. Even still, the characters suffers from a lack of interest and a lack of unique abilities that would separate him from the cast. Sakurai's comment was made soon after the Wii Fit Trainer reveal. And we know Salormano made the post before Sakurai's comment came out. Again, this supports that nothing was known before hand.
So let me wrap it up with this. The reason I never believed this was because Salromano didn't have "insider information" until after the characters were all shown. This seems very fishy at best. If something was known, why not just post it. This didn't stop people from ChaosZero who didn't think much of the info he got. But posting something after you're right is suspicious. Again, it goes back to the Texas Sharpshooter Fallacy. The bullseye was drawn around the shots. Everything suggest that this was simple a guess and that everyone played the fallacy once the unlikely prediction was right. People beleive it because it's too unlikely to not be true. But random chase does not mean that two events are related. When other leakers made a statement, they backed it up. They gave specific information and when that was right, they proved they knew something. This is a situation where someone on;y said he knew something after it was right. This is like me running out on the streets saying I knew the winning lotto numbers before hand. I didn't know anything. I got to make the bullseye after I shot the target. Human minds naturally try to find patterns and make sense of something. But sometimes it's just randomness. That's what this "leak" really is.