I am guessing the immune ones are people who have connection to other people, meaning that the other unconverted partners will be smurfed when their partner is converted. That would include cop teams, masons and mafia. God knows what else you guys might've added in this stew, but if I ever have to come clean as a contagious werewolf I will use it to my advantage and make the villagers think only another mafia team would be immune.

Doesn't really matter who's immune anyway, we won't figure out any more immune players since slowpoke is dying tonight and my power is all used up.

I'm looking forward to getting every piece of the puzzle at the end now.