Wouldn't BSmith come up as mafia if he really was Yakuza? Nothing about them showing up as innocent in the description of the Yakuza, unless I'm missing something:
2x yakuza. They can kill one person per night (unless this person is protected) as a mafia kill. Instead of kill, starting on night 2, one of them can ‘yak’: he kills himself, and targeted player becomes mafia member(there is no mafia kill this night; the only dead person is yakuza player himseif). Everyone can be targeted and there is no way to stop it. The second yakuza can use his ability later, in place of another mafia kill. If yakuza is protected while ‘yaking’, he is alive AND his target becomes mafia! Yakuza can, then, ‘yak’ another player at following night. All townies (including policeman) can be 'yaked'.
Nothing about alignment, unless I'm misreading something. Given that,
Vote: Chaotix
is as good a lead as any.