While I hope it doesn’t go this way, it is absolutely set up to be something akin to Chrono Trigger.

We have a magic-amplifying something that the ancients called a sound/keening. And it moved around, ultimately triggering everything that has happened in the game.

The big problem I see is this: Zodiark was created to rewrite rules of “the star”, and essentially constrain whatever was making the Sound. If you remove Zodiark, you could very well remove whatever restraints were on this sound creature.

We have interstellar life confirmed, we have time travel confirmed. We even have pseudo-zeal appearing in 6.0.

It would not surprise to me at if they got his route, or at least take inspiration from it.

Just imho, but I expect the Sound to be the next overarching story happening in the background.