Yeah, Original 12 almost didn't hold water anyway, with Ness almost being replaced by Lucas in Melee. But now it's a pretty established thing, unfortunately. I guess Jiggs has a big enough Smash fanbase. Sort of like Captain Falcon.
As for Ridley, he was shown immediately after the Yellow Devil, and the Japanese refers to it as "Additional boss gimmicks" (I forget the exact wording, but "gimmicks" was definitely used) rather than "Other boss character appearances". You can say that this is only "HEAVILY implied," but I think we can use Occam's Razor here and just take it at its word. We
can still argue for a dual-role as boss and playable, of course. But I wouldn't say that he's been teased as much as we used to claim in the Ridley thread.
After seeing some of the other threads supporting characters, I realized that we were kind of deluding ourselves (I made this realization when multiple people were saying that Bandana Dee still had a 90% chance after the ESRB leak).
I'm still waiting for some more evidence for or against this leak, so I dunno. As everyone else is saying, extra characters would bring a lot of probably-needed hype. For me personally, getting introduced to all of the Subspace bosses made me super-hyped for Brawl. Remember how we had Petey Piranha's shadow for quite a while before Sakurai unveiled him to us? And how awesome that was? Maybe he's going for something similar here.
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StupendousMike
Zoroark's attack is strikingly similar to Ike's and Greninja's FS, though it's toned down a bit. Dixie's FS would be on a bigger scale than Barbara's attack anyway, so I dunno if we can use that as major evidence.