contains spoilers for The Force Awakens, The Last Jedi, and The Rise of Skywalker
I know there have been questions such as "Why was Kylo wrong about Rey's parentage," but I'm not asking about that. I guess I'm looking for an answer here that would be either from the disjointed movies or J.J. Abrams' original plan.
It seemed established from The Force Awakens that Rey was someone of importance. A very significant scene that hinted that her parentage was known to Kylo was when an officer told him that BB-8 was with a girl. Kylo instantly Force-chokes the officer and asks "What girl?" in a tone implying that he knows a girl who would be involved in such a situation. This fed into the theory that she was Kylo's twin sister or cousin, who he knew previously but assumed dead or missing.
In The Last Jedi, Kylo tells Rey that her parents were no one, but it is told in The Rise of Skywalker that this information was incorrect. It is only when, at the beginning of The Rise of Skywalker, asking Palpatine, that Kylo learns the truth of Rey's parentage.
So - what was that reaction in The Force Awakens? Was Rey originally supposed to be related to Kylo? What was the reason for his Force-choking and anger upon hearing of a "girl?"