Well, continuing to talk about Byleth and Fire Emblem only results in us going in circles. Byleth's in, and there's nothing we can do about it. No game has ever just thrown development time out of the window just to remove content. Unfair? Maybe. Deserved? Maybe. Came at the wrong/right time? Maybe. It's all in the eyes of the beholder, and nobody who didn't like FE before or didn't dislike it before is gonna get their minds changed. And the FE rep in DLC came after the announcement of more DLC, so I think it's pretty safe to say that now FE got its DLC character and won't get another. That would be idiocy considering no other FE game is relevant.
'sides, anybody acting like there isn't a bunch more potential music and stages for Zelda, Xenoblade, and other series is telling lies to themselves. Unless Nintendo has not only the money, but also manpower to burn, it's probably not gonna be a pure new series fest. I don't personally immediately predict them, but I'd say their chances are non zero at worst, if not actually pretty darned solid. I don't have a personal attachment to Xenoblade, and don't think X or 2 look half as good as 1, but I respect their fans and I hope they get a fighter anyway. Zelda I have more of a personal preference for but I cannot think of any fighters that I'd want for any reason besides filling a Zelda void, like fitting in with a potential moveset, besides Ganon without the dorf. And while Ganon would be unique and awesome to see, he'd still be a Triforcer and still another Ganon. Skull Kid, Tingle, Impa, and others like them though? All of them would fulfill that, and while they have potential movesets, I don't hold the same fondness for it. Still, I hope they get in someday.
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On Mandy
I think they might have the sauce, but this could also be a lucky guesser OR somebody faking it by making a lot of guesses and deleting a bunch of them again. I already believe Crash will kick off the next pass, because he fits the same mold as Joker while also being widely popular, thus making him a strong candidate to sell people on the pass and wash the taste of Byleth out of the fandom's mouths. The fact they said this that early means it could be possible, though, they're in the know and have the sauce.