Yashchur didn't vote for either of them.
Kosha? Kosha was in the cage and was eliminating Neo.
I suspect that Ment was the town member in that group of three, as there wasn't much support from the Mafia.
Kosha is suspicious – maybe the Mafia realized they were unlikely to get her out of the cage and simply eliminated Var. But that also seems far-fetched.
Oot is strange, yes.
Wolfstet and Sesam responded almost immediately to Kosha's suggestion about Var.
We have a few options: Execute Kosha, execute Oot as one of the killers today – then we can link the clue about the Crot's Lair to him.
In this situation, I'm leaning towards executing Oot. The illogical scenario with Kosha seems unlikely, although anything is possible.
And the Mafia might be defending Kosha right now, as another possibility. If Oot turns out to be a town member, we can draw the appropriate conclusions.