Originally Posted by
Anonymoose
The Crystal Tower on the First isn't actually a different structure; it's the same tower that exists in our dimension, but from a different time. Mr. Enigma, who most assume at this point is G'raha Tia, has been using the tower either in unintended ways or at an unintended pace to subvert an unavoidable future by changing the monolithic block of 4D spacetime (in the same manner as Alexander banished himself into a stable temporal loop). By displacing the tower onto the First, the tower of today is able to interact with the tower of the future and create a bridge through which to drag the Warrior of Light via a beacon and a conveniently supercharged Echo, somehow.
From G'raha's point of view, he is changing the initial conditions of 4D spacetime and thus UN-WRITING future-history. Perhaps this is true and we're about to go down the Final Fantasy rabbit hole of alternate timelines and a whole new layer of fractal dimensions. I hope we instead just stick to the Alexander mechanics and the truth is just that, because future G'raha never crossed past G'raha's path, he just dosen't realize that this itself is now the stable loop in which history "has always existed".