Eh. I see Zelena sticking around until the end, honestly. She is apart of Regina’s happy ending if you ask me.
We did all say the same thing about Robin, though.
I dunno. If the show is ending with S7 then maybe they are trying to boil down the narrative to just the original/most important. They could write that Zelena is going back to Oz to try and rule there as part of her redemption.
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"He was a lot of things to me" "The only conclusion was love"