Could be. Could also be about Lucifer searching for yet ANOTHER new vessel, especially if he doesn't trust Cas not to try to kick him out at some point. Or it could be Lucifer once again trying to recruit Sam, if only to torment him some more.
Or...dare I mention it? Maybe it could be God trying to find his earthly vessel (since 90% of all none-human creatures in supernatural use humans as vessels, god might as well too (I know, I know, budget savers)).
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