Theories about this dude?
The "drunk" has a piece of twine tied around his face to hold down bloody gauze - with a nice bandage to boot. Oil, rather than blood, seems to be leaking from his mouth. Andy doesn't look into the "drunk's" cell when scolding Chad. He seems to communicate in monkey sounds with Naido.
I'm guessing that he is an entity similar to the Woodsmen, but only from the Fireman's team.
Any non-Billy theories about who/what he could be?
I've been wondering a lot about him. I doubt that Frank and Hawk and Andy would just let him sit in there, oozing and festering like that. Chad might, but, well, Chad can't do jack about it at this moment. So I have no idea. Thought Billy at first, but then retracted that idea. Also thought Walking Dead Zombie, but that's just going too far. Maybe Woodsman in training?
Does Chad directly acknowledge this guy? I can't remember. You would think he would call out of help if stuck in a room with a guy who might have a nasty, flesh eating disease.
It was all quite confusing.
I was intrigued by the). role of CHAD in that scene. It DOES seem evident to me that he can see the Drunk (Billy?). That Chad is drawn into the noisemaking was really compelling to me (ostensibly, he was mocking, but there was something more happening there when all three of them are making those noises.
I took the icky liquid as a combination of blood and saliva, but there is clearly something UP with the Drunk!
I AM the FBI.
If you look close you can see he (the drunk) has a very unusual bandage configuration.
A piece of gauze is attached to his face by a little bandage and a piece of string tied around his head, which I took for a nose breathing apperatus at first.
This doesn't appear to be proper medical treatment.
It just add to the wtf factor, I guess...
If an arm personified as a dancing man can evolve into a neuron tree, maybe the FWWM monkey evolved into this drunk, and (like the Evolution of the Arm) only certain entities can see him.
Why would Chad see him? I got a feeling Chad's gonna turn out to be more important than just a terrible craphead.