Here are a couple of tests to illustrate what I was talking about in my last post:

https://drive.google.com/drive/folders/1dLI9swXfR-v8wreY-X7tlOnO1n3imMgS?usp=sharing

I’m still working out the exact wording of the Luke flashback dialogue, but I’m imagining something like this in its entirety:

“She was quick to learn in our training. But Leia feared giving in to hatred like our father, choosing instead to follow our mother’s path. Leia lost everything in her life, and everyone, yet she still chose compassion over hatred. A thousand generations live in you now. But this is your fight. Let Leia’s legacy guide you on Exegol.”

My intention here is to indicate that confronting her fear is what Leia should have done all along (remaining a Jedi), because she was an expert at resisting the allure of hatred due to her nature of showing compassion for others. Rey has that same capability within her. So Rey has to face her fear of giving in to hatred like her grandfather. This is what she says to his face later on: “All you want is for me to hate, but I won’t. Not even you.” She then proceeds to choose compassion (aka Ben, Leia’s legacy) over hatred (killing Palps and becoming Empress).

EDIT: One other thing worth noting is that Rey’s own parents would take the place of Padme in the mirroring between Rey and Leia’s character journeys. They both look to other relatives they have that weren’t massive d-bags and were loving for inspiration. In Leia’s case, she pursues politics because she wants to ensure she upholds Padme’s values. In Rey’s case, she talks about how her parents were strong because they sacrificed themselves to save her from Palpy. So Rey is likewise willing to sacrifice her own life to save her friends from Palps. Which gets cancelled out in the end by Ben’s own sacrifice, but that’s besides the point. The point is that Rey’s parents being good would no longer diminish Rey’s own struggle with the dark side, but enhance it because she’s directly following Leia’s example.