I think Kosone said he was the fortune teller because he did it for Enomoto. He had a crush on her, knew if the votes failed, Enomoto would be targeted by Ise.
Obviously, his plan didn't work and they killed her anyways.
Anyways, I think the real twins are Hitomi and Kosone. She questioned his existence as a fortune teller last chapter (only asked who he voted for), like she knew he was a villager. And I'm guessing Munakata is the bodyguard since she concluded who would be a possible werewolf like she had to think who would she have to protect. And Andou is just a villager.