I’m with Michael and Darkonedearie. I don’t think Dr. Falicier has “final series villian” feel. He would have been good as a one off with Hades. My money is on Rumple being the final season villian. Or if they wanted to be less predictable, then they could have the villian be this world–like citizens discover magic and Storybrooke and the final arc is about escaping out of SB back to the EF.
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"He was a lot of things to me" "The only conclusion was love"