Another thing we didn't consider is a lyncher/lynchee situation. I only mention this because the last time I saw it it kind of went the same way as this. The lyncher laid low for a while but acted crazy enough to not get night killed, then claimed cop and that the lynchee was scum. Last time the lynchee was a vanilla town, but the mods could have given him bodyguard to improve the chances of him dying at night (since Lyncher is a pretty easy role to win with as it is).
Of course, if this is true then I don't know what we could do about it. It's also a long shot. I'm still buying the cop roleclaim as true.