It was posted on my FC Discord at the time when the blue mage / gunblade / dancer / Viera leaks came out, and I was quoting from memory, but now I've gone and dug back through the conversations to find it.
I have no idea of the source beyond that.
https://imgur.com/a/CWHVfir
On actual re-reading and with blue mage properly revealed now, the information doesn't seem so reliable. ("Blue mage will be melee support DPS"; "starts at Lv60")
But the lore-bits that had stuck in my mind and that do still seem potentially relevant:
- "The Crystal Tower will play a big part in the story, in which it will open a portal that will involve 5.0" (which, as I said, made sense as lining up with the mystery signal from Nero's magitek compass)
- "Minfilia comes back - she's the poster chick for 5.0, like for the box art and such"
(And who's on the Amano artwork apparently for the special edition? Mystery Girl. And who are we theorising she might be...?)
Still, even if the leak is no good, sooner or later something's got to come of whatever Nero's compass detected.
And it just clicked how G'raha could be incorporated back into MSQ without forcing completion of the Crystal Tower raids!
Assume we do have a "time travel to the future" plot incoming - and it essentially creates a second time bubble which we travel to, or perhaps freely back and forth between the two bubbles.
In our present time bubble, G'raha either is currently sealed in the tower, or will be when the player gets around to completing the quest.
Then we move to the future bubble. G'raha has at some time in the past been sealed in the tower, regardless of whether the player has seen it happen yet.
And that, of course, is where we pick up his story, only needing a variable introduction depending on whether you've met him or not.
(Though come to think of it, he would know you regardless of whether you know him, because he's been through the Crystal Tower arc with you, even if you haven't yet... the joys of time travel!)
So perhaps either he's been let out in the future, and makes arrangements to pull the Scions and then us into his time... or we arrive in the future by other means, release the seal on the tower, and then he arranges to pull the others / send mysterious messages / etc (because, further joys of time travel, it doesn't have to happen in the same order things happened at the other end).