Thank you very much Fernehalwes!
I hope they bring back the male Elezen. It could've simply been that they didn't want two Elezens in the End of an Era party for race balance purposes, but I really hope they bring him back somehow. And while it would be hilarious if he was kicked out of the party for being an a**hole, or got disconnected/couldn't log in during the final event, I can see a lot of story potential to actually explain where he was, whether he was somewhere else in the last battle or if they make him a traitor as others have mentioned, etc.

Also found it interesting that all three of the original party has the echo, not just the Midlander...