TBH I think that was one of the problems I didn't like with the Elpis thing.

We know from Graha Tia that you can time travel to an alternate timeline past. His future we are dead so the time loop didn't happen yet everything played out the same. They could of just had us going back causing a split so that any changes (Emet and co finding out the cause then doing something about it) would not of changed our future. It would of let them let us get exposition while just having the alternate timeline be a Graha situation where we saved that periods ancients regardless of it not effecting our own present.