Ill try to keep it pretty short.
Seeing as our "reality" can't exist without G'raha sending himself and the Crystal Tower into our Timeline on the First, how did the world sunder in G'rahas original timeline?
In our timeline, Venat learns about the Final Days through us, and prepares accordingly, leading to her faction creating Hydaelyn. The only reason we are on Elpis to tell Venat this is due to the Crystal Tower and G'raha existing on the First after their time and world jump, and Elidibus being trapped in the tower allowing us access through his memories.
With the original 8th era timeline though, there shouldnt be a WoL timejump to Elpis, so how in the world does Venat become Hydaelyn in that timeline? It seems pretty weird that she coincidentally makes the exact same decisions, choosing the exact same champion (she only chose us in our timeline because she already knew we were her champion since she has MET US) so that the timeline is the exact same up until the end of Stormblood, where the G'raha timeline and ours diverge.
Am I overthinking this? Yes, I am. But it is still really interesting to me, and I wonder if the devs actually thought about this or if Im just missing something that already explains away this hole.