What if Fortune's weave ends up being a time travel Anthology game?
Like i am pretty Sure Fortune's weave won't have a tradtional fire emblem structure and will be more Similar to Radiant dawn where we switch between different Armies for each part of the game. It also wouldn't surprise me if all of these can be tackled in any order you like stands for the last story and maybe one before it (basically how the Medeival and Final chapter of LIVEALIVE worked if you ever palyed that gem)
As for time travel, we never see the Main focal characters in the same scene as each other and Sothis is here, you know the God who controls and trancends time itself. Plus Sothis could find a way to comeback to full power regardless of ending of three houses or three hopes after enough time passes and then can go back in time to do things.
So maybe Sothis is messing with time and space to stop the plans of another Deity sense we know there are other gods in this universe like Epimenides, also would not surprise me if they use time travel as an excuse to bring back a Handful of three houses characters like the Awakening characters in fates and that this game ends with us fighting a God like radiant dawn.