Yeah, you're totally right. Seifer and Barret won't be in it (there just personally favourites of mine) but Vivi would be to similar to Shanatto so i doubt he'd be in it. My money's on Amarant for FF IX. But when they announced the game they said there will only be characters from the snes upwards and the number of chaos/cosmos won't necessarily be the same so there may be more cosmos characters to come (although I highly doubt it)