Nothing interesting will come out of this thread, but I just wanted to share this thought.
Recently, I just rewatched the trailer for Fire Emblem SoV and I found this bit very funny (starting @ 1:00)
https://youtu.be/g6KSzCsrxVI?t=61
And it is very reminiscent of the introduction cutscene from Three Houses where Rhea stabs Nemesis. 😄
TL;DR Three Houses just copied SoV.