The dynamic between the Poss and Psy is contrary to social deduction. “I’m not X anymore, therefore X is Possessor” is not social deduction. If possessed people were ‘converted’ to the Possessor’s team, there would be more social deduction involved in finding the possessor since those he possessed would not out him in dead chat and also the dead would be less trustworthy.
Possessor used to be wrecked with codewords but he was given the ability to read whispers to avoid this. I hope this can be solved too.