Okay first things first.
1. It's probably not a heavily role madness. And I'm assuming there are quite a few vanilla towns. If that's the scenario, PK being Lynch Proof for two days or more (as he hinted) seems awfully Unbalanced a game. Al would not allow that.
2. If PK is indeed lynch proof, what are the chances of him being scum and town? A town Overpowered JOAT or Mafia whichever, cannot even have "2 lynch proof ability" given Al being the host.
3. If he is town JOAT, and hence have only one lynch proof ability, he needs to be very selfish a town for wasting his ability and getting targetted instead of helping trying to find scums. He seems to not care, at all. If that's the case, I'll ask, if there's any, vig to shoot him at night. Selfish a town = scum. If he was indeed lynch proof and a town he would not have wasted an entire phase for us, instead he should have defended himself instead he was naive till the end.
4. The chances of him being scum? He was sure he won't get lynched DP1, he can clearly state that he is lynch proof again in the thread, and we won't lynch him and he will be there safe and sound so didn't bother much last phase. For this phase though at the starting a saw a long post, probably the most he tried till now.
5. He is a third party.
These are my theories about him. I'll now look at others without removing an inch of Scum read from him.