Wonder what Crowley’s holding over him?
Would they be in this trouble if Sam just let Dean torch Crowley’s bones?
Good point. Unless there’s some mechanism that only allows soulless vessels through. Like Skynet’s time machine?
In which case, Crowley is bluffing.
Well, they’d have no way to get Sam’s soul back now right?
Wouldn’t all souls in his possession just go back to original owners? And how did Crowley become King of Hell?
I doubt it. They swear they’re not going to do Apocalypse 2.0.
The King of Hell, lying? Say it ain’t say! 
That’s the assumption, but I don’t know if it’s ever been tested.
And how did Crowley become King of Hell?
Power vacuum. I’d like to think that they’ll explore it more fully eventually.
On Supernatural, everybody just wants a piece of those monsters
Friday night’s Supernatural, “Family Matters,” managed to pack a hell of a lot into one episode. Now we know the secret connection between Grampa, Sam, and the monsters. And the answer will send the brothers on a quest.
my theory. Crowley’s bluffing about king of the hell part.
Like Cass, Crowley is only one of the major forces fighting for supremecy after the power vaccum. I am guessing that the king Vampire is in another camp that’s vying for power in hell.