Mafia 27. The problem of Bovblob residents

Arch is more likely to be a town member than mafia, or he's just playing very well.

I also think so, although the evidence strongly points to him.

Kostyan is definitely mafia, and I have my own suspicions about the death.

In my opinion, it's not definite, but the probability is high. If Arandor really has the "outsider" status and is a town member, and it seems that way to me, then he's either a blocker or a blue unicorn; in any case, there's only one town role left with the "outsider" status that Kostyan could be, and a lot of mafia roles.