I agree with both of your points to an extent but if they play out the typical Ariel (Disney at least) story, there is no reason why Ariel couldn’t go with them and be a guest star.
My big point is that I don’t think putting Hook with Ariel means he’s leaving the show. I would wait to see how it played out. Hookriel is a fun crack ship 😆 and in my head I think it’s more likely he’ll be with someone else, one of the mains. It just depends on how H and K want to tell their story but I don’t think we should discount anything at this point.
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"He was a lot of things to me" "The only conclusion was love"