I think we're all overlooking the extremely obvious guilty person here. I mean, this person has completely ignored just about every other player, hasn't even bothered to throw out any votes or even suspicions, nor has even really talked about the game at all. All he's pretty much done is comment on how good the music is in Sonic '06. As someone who has never played Sonic '06 and has totally ignored the videos posted of its soundtrack, I'm qualified to say that it fully sucks. There's no way he could like it, and no way any aspect of Sonic '06 is any good, so he's obviously lying and hiding something.
Vote Phil
Sure, one could argue that he didn't even sign up to play the game. Sounds like a good way for a Mafia to pose as a townie. Not buying it.