I don't think this was intentional...
What qwerter said. Either the mafia or the town wins, and the survivor is added to that group if he is alive.
And...I screwed up. I misses two sign-ups earlier, so as such we have more than 24 people - which I had decided to avoid. So I'm pigeon-holed into cutting two players out, or adding more spots. For fairness, I'm going to do the latter.
I'll elaborate on this in a second. We now have 26 people signed up, so I'll allow four more sign-ups and decide what roles to add tonight.