x/unchained's story p much takes place mostly out of sight of the foretellers - only one has had non-generic dialogue so far - so they're definitely kind of "two halves of the same story"
the people Ava's talking to in that last scene aren't all from her union - she sounds like she's recruiting people to essentially carry out the plan in Kairi's grandmother's story
spoilers but. her plans are to send them to the future iirc? to survive the coming calamity and help keep the light alive. or that's the gist of it anyway!
And then return to the world once it's done. That's why you see Ephemera in dreams a few times , he's already there prepping the way for other Dandelions
THE PHANTOM ZONETHE REALM OF SLEEP