His leak is killing me. I want to discard it so bad, but it's the only link ToS has to hard evidence. The second somebody finds a shorter chain than mine, I will gladly pour the gasoline for the great purge from memory his leak warrants.
I did think of something, though... and I hate to be the one giving this guy any credit, but someone's got to do the dirty deed. Think of it like I'm showing you the open grave, and I'm begging you to grab a shovel and bury it for good.
The two characters in his leak who stand out the most, to me, are Wonder Red and Phazon Samus. He seemed totally sure that these were playable characters, until Wonder Red turned out to be an AT. As for Phazon Samus, is it possible he meant Dark Samus, who's also an AT?
Maybe you see where I'm going with this...
If there's anything to Mr. Prince's leak at all, I think he (or his source) saw some character models who moved around the stage like playable characters, and immediately assumed they were playable. We have Dark Samus in 3DS, and her AT does move around the stage in a manner that gives the illusion of a playable character - she jumps, she targets, she attacks, she sticks around for a while, and she even has a player cursor over her head (to match that of her summoner). The general tone of his posts sounds like someone who is overexcited and not very careful with his information. He's obviously not 100% correct, but... does that mean he's 100% wrong?
Is this a guy who really saw ToS? Is this a guy who really saw Smash World? Is this a guy who either saw moving character models or screenshots of these characters with player cursors over their heads, got excited, mistook them for playable characters, and hurriedly reported a mixture of ATs and playable characters as all being playable?
You keep saying "Smash World is a fairly generic name," and yet he gave a rather detailed description of a game mode that doesn't read like someone's fantasy. We have hard evidence confirming its existence (debatable whether it still exists). We can't simply let it go because it sounds like an easy guess, much as you and I both want to.