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Regarding Pali, there are hardly any options left. This is what happens when a town is constantly plagued by indecisive players; sorry for the expression. I don't rule out the possibility that the Mafia was deliberately leading him towards NNV. The chance that he's the Sheriff is extremely small, so there's no other option here.
p/s Who did Rimpel pretend to be?
And Ment is either an Investigator or a Devourer. Most likely the former.