Given Kripke's penchant for messing with the fans, I totally believe that he quite gleefully agreed to adding a missing sibling. You did see the reference to Cousin Oliver in the name of the diner, yes? And the poster advertising the Fonzarelli water ski show? This ep was very deliberate, I think, considering Kripke's sense of humor.
I'm not sure if they knew they were getting a S5 when they shot this or not. If they did, and they were plotting into S5, I think it's possible that they at least had a notion of needing some sort of contingency plan. It's at least consistent with the "Dean can be replaced" line. And if Kripke is to be believed (which, you know, take everything that man says with a shaker of salt), they never intended for Dean to be Michael's vessel. Not sure how much tap dancing they're doing now that S5 is over, but I think it's at least a possibility that they were putting together the framework, if not the specifics, at this point in time. 'Cause there's only 3 more eps between this ep and the ep that reveals Dean as the Michael Sword.
Introducing a younger, cuter relative
There is an inherent flaw in this line of reasoning. No one will ever be cuter than Dean. Or Sam, but he didn't get to use the puppy dog eyes in this ep.
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I'm not sure if they knew they were getting a S5 when they shot this or not. If they did, and they were plotting into S5, I think it's possible that they at least had a notion of needing some sort of contingency plan. It's at least consistent with the "Dean can be replaced" line. And if Kripke is to be believed (which, you know, take everything that man says with a shaker of salt), they never intended for Dean to be Michael's vessel. Not sure how much tap dancing they're doing now that S5 is over, but I think it's at least a possibility that they were putting together the framework, if not the specifics, at this point in time. 'Cause there's only 3 more eps between this ep and the ep that reveals Dean as the Michael Sword.
Introducing a younger, cuter relative
There is an inherent flaw in this line of reasoning. No one will ever be cuter than Dean. Or Sam, but he didn't get to use the puppy dog eyes in this ep.