tA thing I think not many people have considered is that mafia could kidnap one of their own. The kidnapper role could be used either as a second roleblocker, or to protect a mafia member from being investigated (or shot, but I don't think the mafia would've anticipated a shot N1). With two cops originally in the setup, and the lack of anyone claiming they were kidnapped, I think it's at least reasonably likely that this is what happened.
And the second point, yeah, I hadn't thought of that.
3) What?