So, theoretically, there could be other versions of us as well. Your Edelgard might show up here, and the Dimitri who harbored Rhea as well. I wonder if this place even has the resources to sustain us all.

[Maybe a Bernadetta that doesn't die... Either way she has yet to see another version of herself, or even another version of Dimitri at this age. Or at least she thinks that's the case. It is really hard to tell when some of the paths share similarities.]

So if the theory of the professor being at the crux of it all is correct, then everything before them meeting us should all be the same.