Bingo.! It’s called the Dweller on the Threshold (which I’ve mentioned somewhere on here before)
Luke failed to overcome his Dark side (ego) in the cave,
which leads to Yoda and Ben saying “He’s not ready yet”…which leads to them also saying “But there is another” (Not Leia)
Which leads to Anakin/Darth Vader being the one who overcomes his “Ego” and redeeming himself.
That’s the twist of Star Wars (assuming there weren’t newer movies out since then)
Darth Vader is the (secret) protagonist…not Luke.
Why the reboot was about Anakin’s/Darth’s Journey in prequels.
(I just gave somebody a synapsis of a college level movie studies paper)