A timeloop is already out of the question as the future on the Scource was altered the moment we travelled to the First.
Exarch G'raha comes from an alternate future that will now never exist.
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IVth being yet more Ivalice especially irks me too. It got an entire Raid, on top of other things to boot. It’s had more than enough. While IV has marginally more fan service than other FFs making the Legion devoted to another Ivalice expy is pretty bad.
At least the seeds for Garlemald being wiped out are being sewn slowly but surely.
As far as the Namazu A World Forsaken section goes, that clearly appears to be the Namazu recieving visions from our current timeline. I think this feeds into my own notion of how it works, which is that there are not multiple timelines, but instead only one. G'raha isn't erased because his existence in going back to "change" the past is actually a causal loop, a paradox that always occured yet did not simultaneously. And as for Mikoto, we've already seen a lesser version of her future sight before, possibly even used it depending in your interpretation. Alexander, it was simply using infinite computational power to calculate the future, while it's own existence is the same sort of paradox G'raha is.
Pardon the bump-
I was picking up a new job's weapon today and decided to stop by Marsak for a lore refresher. They renamed what Castrum Lacus Litore's native name used to be. When the patch launched it was Alamut, which both Anonymoose and I made note of on page 1. But now it's Alermuc. Presumably they changed it because Alamut is the name of a real-world place.