
Originally Posted by
BlitzAceRush
We're also not sure what the nexus point was, the Tower simply being there may not have change things enough to split time as if Graha had say died in the attempt the tower would have sat there and done nothing, it's actually a good question, what did change? We know in the doomed timeline that the First falls and we die on the source, so what caused Minfilia to succeed? Or did she always succeed and then the first falls later?
I don't think it's actually a matter of Minfilia succeeding or not—that's something I take as a given. She arrived on the First, halted the Flood of Light, and proceeded to spend roughly a hundred years trying and failing to deal with the Lightwardens until, suddenly, the whole world got sucked up into the Source—just as suddenly, the WoL was one of the first casualties in Black Rose being unleashed upon the Eorzean Alliance's army, and boom, we've got the Eighth Umbral Calamity. If Minfilia failed from the word "Go", then either the First would have become a Void of Light or the Eighth Umbral Calamity would've happened much sooner than that.
Going back to my "maybe there's a third timeline" bit above, here's a hypothetical example involving Nidhogg's Eyes, to demonstrate how this might've played out.
Timeline A:
After defeating Nidhogg, the WoL and Alphinaud keep hold of his eyes. They never get traded around to Ilberd, and so he never embarks on his suicidal primal summoning/false flag operation.
The WoL is, somehow, sent to the First to aid Minfilia. Events similar to Shadowbringers' story play out, culminating in the death of either Emet-Selch, Elidibus, or both.
Someone from this timeline seeks to change the past, and as such travels back in time.
Timeline B:
That someone plants the idea in Aymeric's mind that Nidhogg's eyes should be cast into the Sea of Clouds. In the heat of the moment, the WoL and Alphinaud do so. Ardbert and co. retrieve the eyes and give them to Elidibus, who in turn gives them to Ilberd.
Because Ilberd's summoning of Shinryu is enabled, the events of Stormblood happen instead. The WoL never travels to the First as expected, and ultimately perishes from Black Rose, ushering in the Eighth Umbral Calamity with their death.
Two hundred years later, Syrcus Tower is sent back in time and across the Rift with G'raha Tia in order to change the past.
Timeline C:
From the perspective of the Source, Timeline C is exactly the same as B, right up until the Scions are unexpectedly called across the Rift to the First. The WoL is the last one to make the journey, and between Gaius and Estinien's Excellent Adventure and the War on Garlemald stopping with a ceasefire, Black Rose is not deployed.
On the First, Syrcus Tower's sudden appearance causes history to play out in a significantly different fashion, culminating in the events of Shadowbringers.
That someone from Timeline A may or may not still be around, and we have no idea who it even is.
Based on the absurd hypothetical scenario above, it could be a vehicle to return Lahabrea to the plot. Perhaps getting sucked up into Nidhogg's Eye to be used as a power source by Thordan didn't kill him, and since the eyes weren't drained of their aether to summon Shinryu in Timeline A, he was able to escape somehow.
Now, I have absolutely no proof that this is the case—I'm more inclined to believe that the possibility is just me reading too much into this, as the only thing even opening the possibility is a single line from a single cutscene. Perhaps in the Eighth Era timeline, Minfilia never expected us to arrive at all, and the actual point of change was earlier than Syrcus Tower's arrival date.