Figured it was him back a few seasons ago especially this scene.
Yea the 200th episode pretty much confirmed it at the play when he came at the end
I had a major feeling he had to be a major deity since the begining. I mean he was writing the entire sam and dean life story I was like this isnt a normal scribe I thought he was actually metatron himself or the gatekeeper of heaven.
I was fooled.... They got me good....