Okay so we know Drayton’s and Lacey’s nepotism relationship already, and their biomes’ themes reference them as well. The other two+the central plaza, however, replace that part of the theme with the SouthEast Unova Route Theme. The only two gyms there are Striaton and Nacrene, with Crispin happening to look and act like the Striaton Trio and Amarys and Cyrano happening to look more like Lenora than any other Unova gym leader. I get that they’re most likely just related to random literal who NPCs or future characters instead of just more gym leaders, but my theory is that these are the best candidates as of now. I know they live elsewhere but so does Lacey and that was a nothingburger.