Maybe Bae changed his name here as well, i doubt with him returning to EF, he would keep the name Bae, and doubt he would announce to everyone he was the dark one son, so maybe in this AU, Rumple never knew Bae was there and died, like they never knew the relation btw Bae and Rumple.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".