Another random thought. George intended for Leia to be revealed as the real chosen one in Episode IX. This could still line up with the prophecy, since when Leia was born Anakin Skywalker was dead thus “born to no father”. However, with Rey finishing Leia’s Jedi path in TROS and finally defeating Palpy, they both technically become part of the chosen one prophecy.

And the fact that George intended to dive headfirst into the microbiology side of the Force in his sequels screams to me that he intended to show how the midichlorians can be influenced to create life. He probably planned this dark Skywalker twist for episode VIII. I think this is why he planted those seeds in ROTS, because he fully intended on confirming it in a way that wasn’t just dialogue but rather visuals. But obviously that couldn’t fit into a movie as full as ROTS.