I don't mean to nitpick, Tom, but is this really your plan?

There was a certain amount of uncertainty about free will, I thought. When Dean went to get Chuck after Castiel "let slip" the archangel thing, Chuck said, "I didn't write this!" Which implies that Castiel, at least, has free will. The fact that Dean couldn't get out of it on his own (the "red" motel, not getting into a minivan accident, etc) implies that he does have a destiny, as people keep telling him, and thus only has limited free will.