u/Swimming-Start9627

This may just be a silly thought/theory that actually has no ground to stand on. It just suddenly came to me and I thought it’d be too cool of one not to share.
Basically, since every traveler can pick their siblings in the start of the game, what if that’s also part of the story? Both versions - Aether as traveller, Lumine as the abyss sibling AND Lumine as traveller, Aether as abyss sibling either happen simultaneously for some reason or it’s a big time loop with both of them experiencing each other’s journey without knowing that. It’s probably not true at all but it’s a fun sibling theory, I really love both of them and this just seems like a fun connection.