This was something, really, really awesome.

Whoa, this was a fantastic one-shot, dude

I'm surprised this hasn't garnered more reviews!
I think you've written a very good little snippet here. It fits nicely within the universe - a good justification of things that brings together a few fan theories in a reasonable way. You keep the characters /in/ character and it feels very natural. I hope to get to read more from you in the Supernatural world!