I’m just playing around with the idea that this whole Rey Palpatine thing is a lie by Palpatine. My original idea was that it was just a few visions planted by him in her mind, but as people pointed out this would mean that all Rey needs to do is reject that story for the drama to end. So maybe Palpatine’s presence in Rey’s mind is more than just visions, but is closer to a full-on possession. If Rey was being not-so-subtly controlled by Palpatine, emotionally and mentally, then her strange actions, her abandonment of her friends, her dark powers and visions of an evil version of herself, all of this would make sense.
With this idea Rey is genuinely compromised, just as Kylo was when he fell to the Dark Side. This ties in nicely to Ben’s shattered psyche, why he continues to follow a dark path even when he seems drawn to the light. He is still being controlled and manipulated by Palpatine, against his better nature. He only comes fully back to the light by literally disassociating and conjuring memories of his dead father to converse with. So as Rey falls to the dark, we are getting a vision of Ben’s fall to the dark as well.
“Rey….wherever you are…You are hard to find.
“You are hard to get rid of.”
“I pushed you in the desert because I needed to see it…I needed you to see it…who you have become. You’re corrupted. Rey…”
“You’re lying.”
“You were right…your parents were no one. Worthless drunkards from the outer rim.”
“Don’t!”
“But now you have a different story in your head.”
“I don’t want this!”
“Do you hear voices?”
“No!”
“Perhaps you see visions.”
(Rey sees the vision of her parents and her abandonment.)
“My Love…be brave.”
“You’ll be safe here…I promise.”
“Come back! Nooo!”
“So now your parents were heroes. I wonder why.”
“Stop talking.”
“You truly believe this, don’t you?”
(Cutaway to heroes capture)
“You really believe your parents loved you…and sent you away to protect you. And now I suppose they will die to protect their beloved child. Such noble scavengers.”
(Rey sees her parents get killed.)
“So that’s where you are.”
“I know how this story ends…why Palpatine wanted you dead. I’ll come tell you.”
…
“Why did the Emperor come for me? Why did he want to kill a child? Tell me.”
“You already know the answer, Rey. The answer he gave to me on Exegol. You’re a Palpatine.”
“The Emperor once corrupted me, just as he’s now infected you through our connection. But I fought back against his visions. I know we can destroy him, Rey…and bring a new order to the galaxy…together.”
“You know what you need to do. You know.”
“I do.”
…
When Rey is talking about vengeance for the death of her parents, Finn’s concern about this not sounding like Rey is well-founded, and her strange demeanor now makes sense. We are not supposed to believe that she is being logical, since she, like Kylo, is unable to see clearly when under the influence of this dark power.
…
For this, it would probably be good to delete or change Kylo’s line of 'The Dark Side is in our nature. Surrender to it."
Perhaps it can become “The Dark Side is corrupting you. Don’t surrender to it.”
Cutting or changing this line would make Kylo into the sympathetic character here, trying to prevent Rey from falling completely under Palpatine’s control.
…
Luke would need just a bit more dialogue to allow this new version of the story:
“What are you most afraid of?”
“Myself.”
“Because you’re a Palpatine. Leia sensed that fear in you.”
“She didn’t tell me. She still trained me.”
…
In this version of the story, it doesn’t much matter what sort of Palpatine Rey is. Most of Kylo’s dialogue would be focused on questioning Rey’s behavior. It would be nice if there was some explanation of just who she was in his story, and a mention could fit in somewhere in the hangar scene, but again it’s not crucial, and may be better left to the imagination.