I remember someone mentioning the clue about the payment that was on Pil and trying to connect it to the 4th game, which is in Zubr's signature.
Zubr is also on my list of potential mafia members, but honestly, it seems like only one of you is likely to be it, either you or him.
Dexter doesn't need to wait until night to offer help; he can say what's going on sooner. Although, I haven't really figured out his role, so it's hard to say, but Watson definitely can. By the way, a couple of potential Watsons have already checked out and didn't seem eager to defend Lord. That's something.