Could they not just make them not playable in 8 player Smash?
Most people don't even touch that mode 99% of the time, and it seems really weird to use something so minor as justification to completely skip over the game's primary hero and add yet another Xenoblade character who works entirely independently when the series that they're from is so heavily focused on party synergy in battles both mechanically and thematically.
I mean this is kind of like if Shulk was a Mii outfit and then they made Seven playable instead. And don't get me wrong, a XB2 character is a XB2 character and it seems like they represented them well in terms of them being shown on their own, but it's still kind of odd.
Meh-meh, gamerpon me try to find PS5 but is impossible. Friends help?