Let's play a game: Save the Ancients!

[KrasieArk]

I'm not 'bad faith arguing', and in jumping in with that right away you're clearly showing that you're not really coming into this in good faith yourself; you just want to come in with a cheap gotcha. But I can tell you why this is, at best, a bad idea:
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When it comes to the topic of the Ancients you absolutely are. However are we just going to ignore that all your examples happen in a Sundered World (AKA a Shard of 7/13ths) and in the Unsundered world we are playing by a different set of rules? Ancients don't have the restrictions in Aether like the Sundered.

In our timeline after the initial Final days killed a good portion of the Star and the Ancient people. Following that with an ever smaller population pool they managed to get more uses out of Zodiark with just their sacrifices alone no Ambient Aether required. So unless my math ain't mathing anymore I don't see why they wouldn't have an issue taking Aether from a much larger population of Ancients without requiring their bodies and souls. Call it an Aether Blood drive and take a small bit from the Star symbolism and what not.

Also your doing it again in response to Redheadturk. Bad faith arguments Tsk tsk

Once the congruence has happened, there is really no worry of us getting stuck even if we do happen to be there running fates/cleaning up the monster prison/etc when it happens.

Then allow me to elaborate and please correct me if I'm veering into the realm of Head cannon. In the case of Graha Tia being unable to return to the Alternate 8UC timeline I've always been lead to believe he became stranded because of the appearance of The CT in the First. This event so dramatic fundamentally changed the course of history that it brought us to our current time line.

My logic here is if lets say the WoL leaves some Hypothetical form of irrefutable proof that fundamentally changes the history of that world wouldn't they be stuck the same way as Graha?