Since Edelgard and Rhea act as foils, maybe CF's ending is supposed to be Edelgard altering history to suit her own purposes much like how Rhea did in the past? She can't suppress or change the entire truth, but she can bend it so that she looks as good as possible and her reign appears to benefit the people more than it actually does. Maybe there's hope that someone else down the line in history will investigate and uncover the truths Edelgard obscured as well.
Ohhh I really like that! It can really tie everything together, that to the end Edelgard is just Rhea But Actually Tyrannical :O













