Time for my Star Wars controversial opinion of the day:
I think Rey as a "nobody" only works to an extent. If they kept everything Kylo told her as the truth, in the third film Rey& #39;d become a tool to Kylo& #39;s redemption because she& #39;d not be connected to the heart of the story.
She, the protagonist, would be merely a watcher to the Skywalker drama again (Which is where it lies the heart of the story). She had to be connected somehow to not let her protagonism fade away.