I haven't seen anyone here indicate that they do not understand those facts.
Also the Eighth Umbral Eracity-statesworld (and the Empty) are not "void of aether". That description goes to the opposite state, as seen in the World of Darkness.
An umbral (Light) charge brings the flow of aether to a halt. It isn't destroyed, just frozen and inhospitable to life. If you think of aether as water then the Eighth Umbral Era is an ice age.
Up until now we had to assume this was an irreversible effect, to justify the writers' logic that it made sense for them to throw all their ingenuity into saving another version of the timeline over improving their own. The ending of this new story seems to imply otherwise. Perhaps it's not looking as bleak as it once was and the aether is slowly recovering, even though earlier generations thought it couldn't.
You're confusing the cause and the effect.
What the Exarch said is that if the Calamity is averted and the original "dark future" timeline ceases to exist, that may cause the Crystal Tower to vanish along with the entire timeline it came from. There is no "going back to Eorzea". There is no Eighth Umbral Era and no original location in Eorzea for it to go back to. It simply ceases to be.
What you seem to be getting from this information is that the tower must return to where it came from to prevent the Calamity. This is not the case. Even if the Exarch's prediction was correct, the tower's absence would simply be an indicator that the timeline had changed, not the cause of it changing.
Additionally, you're playing with paradoxes if you assume that the necessary outcome is that the original timeline will be overwritten and the tower will vanish. The consequences of that approach form an unresolvable loop:
1. G'raha travelled back in time and to the First to prevent the Calamity.
2. The Calamity is prevented and the timeline overwritten.
3. Because there was no Calamity, G'raha did not travel to the First.
4. Because G'raha did not travel to the First, the Crystal Tower was never moved to the First.
5. Because G'raha and Tower were never in the First, nobody was there to kill the Lightwardens and remove the excess Light.
6. Because nobody removed the excess Light, the First is still full of Light and primed for rejoining.
8. Because the First is still full of Light, Black Rose happens.
9. Because Black Rose happens, eventually G'raha travels back in time to prevent...
If this is the scenario you want to play, where do you stop that paradox loop? Even if it somehow didn't lead to the First being re-doomed, I would find it overly convenient if the tower vanished and nothing else. What happens to the Crystarium? What happens to any technology or building materials they ever derived from the artifacts in the tower? The whole town could literally fall apart - assuming it ever existed. Do people remember he was there, or are the memories erased as well?
The scenario in which the tower vanishes is fraught with paradox and the risk of undoing the very thing it was meant to achieve. Other scenarios allow for time to be altered without this happening. We seem to be in one.
The simpler conclusion is that G'raha's expectation was incorrect. From all the evidence we now have, the specific calamity he came back to prevent can no longer occur. The First's Light has been dispelled and is no longer available to supercharge a Black Rose explosion even if it was set off. Even if a different disaster happens, it will not match the scenario that G'raha learned of as history in the dark future, and events cannot lead to that particular future any more.
The non-collapsing split timeline makes the most sense because it means that G'raha's knowledge of the dark future doesn't form a paradox once that future is "averted". It still exists. He was there, even though he can't return.
I don't know about Chrono Trigger, but the time travel logic of Majora's Mask is not applicable here.
The Song of Time rewinds time so he can live those three days over and over again, with the things that happened one time not carrying over to the next. Everything resets every time you go back. (Alternately, every time you go back, you're leaving that timeline to its doom and creating yet another one that will probably share the same fate.)
Time travel here is the opposite. Outside of the exceptional circumstances that cause the split in Shadowbringers, there is a single constant timeline and (as seen in Alexander) your time-travelling activities can merge into the sequence of events that were always there. If you go back to a time and place that you previously visited, you will encounter your past self there. You can't simply attempt the same day over and over - either you'll get a pile-up of alternate selves or you're definitely splitting the timeline with each attempt.
Additionally, Link is not coming from the future to change the past, but is simply manipulating the present. Meanwhile Ocarina of Time does involve changing elements of the past to affect the future, but it runs on a completely different style of time logic to what is happening here. The mechanisms are simply not compatible.
The price and frequency of time travel is also very different. Link can move freely through time as often as he likes with no ill-effect, and must do so to drive the plot. G'raha travelled once, at heavy personal cost (again, I think the majority of his crystallisation happened as a direct consequence of the trip) and will not do so again. Once he arrives in the First, the actual time travel element of the plot is over and everything else happens in real time.



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