The case for Rey Skywalker can be summed up in a few lines from TLJ:
Luke: You went straight to the dark. […] It offered something you needed. And you didn’t even try to stop yourself.
Luke: […] My nephew with that mighty Skywalker blood. And in my hubris, I thought I could train him, I could pass on my strengths. […]
Rey: […] Kylo failed you. I won’t.
Luke thinks Ben fell because of his heritage and Luke failed to help him overcome it as he did. Now Luke is terrified it will doom Rey as well (first quote). The fact Luke never actually trained Rey in The Last Jedi is a very important plot point. By attempting what Luke did for Vader and then refusing Kylo’s offer to join him, Rey showed Luke the Skywalker bloodline wasn’t predisposed to the dark, but the light. He didn’t need to pass on his strengths to her, she already had them.
See our full case here.
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