According to the rules of the infobox, the last seen counterpart gets the priority. (If I understand it correctly).
This also ties into the Ruler of the United Realms. It should be Regina. For some reason, being called Regina, having Regina’s hairstyle, and memories, isn’t sufficient as proof. Nor Zelena, neither Gold.
Adam’s post says that the last seen counterpart was Gold in an unknown realm.
Link: https://mobile.twitter.com/AdamHorowitzLA/status/998614480194977792
For the broader, “Is this the counterpart or the original at the end?” We have a sript that at least confirms a few. Regina and Snow. Other background scenes used name placements that had people like Margot and Tilly and Marco and Pinocchio, etc.
Link: http://alyssinmymind.tumblr.com/post/174125101992
I mean, the script is the word of God and canon as it literally is the show written down in words.
Proposal A: Use the scripts and thus these exact people are adjusted accordingly.
Proposal B: Include Zelena and others in the finale is called by name or dressed accordingly, like Tiana and Ella.
Thoughts, comments, motions?