(Note: I haven't seen yesterday's ep yet. So the entirety of this post could be completely null and void.

)
Nah, doesn't gel for me.
My hope? (I can't say "my theory" because I don't
expect them to do this; I just
hope they do.) My hope is that Ruby (aka Blonde Demon Chick) is Azazel.
Let me explain.
It has
never made sense to me that Azazel/Yellow-Eyes is dead. Why? Because he's not stupid. He has plans that take decades if not longer to come to fruition.
So if he has the Colt--the only weapon in existence that can kill him--and he needs to use it as a key to the Devil's Gate...
Why in the name of creation did he leave the last bullet in the friggin' gun?!?!
It's bugged me since the episode aired at the end of last season. But what if he
didn't? What if he replaced the bullet with a "normal" one, and faked letting it kill him?
Now the Brothers Winchester think he's dead. They're off their guard, at least in terms of being on the lookout for his influence. And now that he knows that Sam isn't going to be
tempted into leading the army, maybe he thinks he can nudge him into doing so as an ally.
And since demons can take any form, what better form than that of an attractive blonde?