nomura already said that zack is the only FF character in BBS.. so stop with sephiroth already..
He did say only one FF character (besides the Moogles), but I'd be okay if he was just telling a white lie so he didn't spoil anything about him or this guy..
Just because he said one doesn't mean the secret boss isn't a FF character to. Like I said in the quote above, he might of just told a white lie in order to NOT spoil the fact that it's a FF character. I'm just hoping that if I'm right it's not Sephiroth.