Exactly my thought, and why I think he should say “Rey” first.
Luke: “Rey, final lesson, some things are stronger than blood.”
It’s hard to extract “Rey” from this scene because a lot of music is in the center channel. This is beyond my abilities, unfortunately.
Ideally, what should be able to happen is his line is muted there and then an AI generated version of “Rey…” is placed before or the original line is simply shifted over (with its background noise removed).