So there could be a total of 6 anti town?
Or can only mafia be cult. I think I read that somewhere but now I'm on the fence about it.
Yes 6 is the possible maximum. Mafia cannot be converted into cult (third party), only town members can be converted at night. If a cult member tries to convert mafia it will fail. If you're interested in any more details or I missed something for you it should all be in the first post.