I think we're wasting our time right now. Just arguing and shouting. Guys, even if Master is Mafia, he's probably not very useful: he's too risky. It's possible that the Mafia team is using him as bait because he's some kind of pawn. If Kosha is Mafia, then there's not much point in executing her, because it won't give us much compared to executing other negative roles.
Therefore, I suggest we forget about all this and focus on solving the clue. Seriously, if we eliminate the blonde, that's almost a guaranteed win.