Another thing about Neogaf it was also one of the early ones to list Isaac as playable, when Isaac was still seen as this niche character from a dead series that no one cared to place on their top smash ultimate newcomers list.
Though the part regarding Terra, this might make them a bit more unlikely.
Sakurai: "But on the other hand, if you think about who to add from Final Fantasy, it’s hard to come up with a choice that’s not Cloud. We could have used Terra or Bartz, protagonists in their own right, but I feel like there would be some people who wouldn’t know who those characters are."
Though if we think of Gematsu, it was right up until a point, Chrom and Chorus Kids didn't happen. And there's always the Sakurai factor where he says a character can't happen one game but make them work the next. But I feel like Geno is more likely to be the possible Square rep with this game focusing on fanservice/the ballot.