Consider: Happy mask salesman
Masks or faces seem to be a common thing in zonai jewelry, and the Hero’s Aspect item in totk looks like some sort of mask itself! There are plenty of interesting things that seem shrouded in mystery, from the Salesman with his many masks, the keatons whose faces are popular masks for children, the zonai sages and their masks, all the way to the twili with their fused shadow helm.
If the zonai were the ones raised to Skyloft, perhaps some of them never made it to the safety of the island and thus had to survive the devastation of the Surface in a different way.
Perhaps in Hyrule there have long been interlopers among the people, hiding their true forms with strange magic…