Interesting theories, although those are all far more intriguing than I expect to see in a season-long arc on Supernatural. I guess we'll see.
"Or maybe... Amara sent Dean back in time. They also hinted at THAT as being something she could do, because she was briefly going to do it for Rowena. So... there's that possibility." I don't remember that. In 11x22, Rowena and another witch were working together to cast a spell so they can travel back in time together. Amara wasn't involved in that. Is that what you're talking about, or was there another scene I've forgotten where Amara offered to send Rowena back in time?
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"Or maybe... Amara sent Dean back in time. They also hinted at THAT as being something she could do, because she was briefly going to do it for Rowena. So... there's that possibility."
I don't remember that. In 11x22, Rowena and another witch were working together to cast a spell so they can travel back in time together. Amara wasn't involved in that. Is that what you're talking about, or was there another scene I've forgotten where Amara offered to send Rowena back in time?