Supernatural Season 12 Finale Theories

So as I have been both anticipating and dreading the season finale of Supernatural I have been thinking over some theories in my head. There are so many theories floating around out there, but one of the ones I am choosing to focus on is Mr. Ketch. I have been trying to understand what the purpose has been showing the brainwashing scene. First off I have so many questions about this scene.

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