The Chosen thing was originally about the Sun of the Suns. In the time of greatest despair their shall come a savior and he shall be known as the son of the suns. Journal of the Whills. Luke was the son of the Suns. Not Anakin. The Saga of Darth Vader was a very late edition.

You know how I know the balance of the force did not exist until the prequel. Because Luke fights a reborn Palpatine in Dark Empire and that was canon.

Just like the original lore had Jedi marrying and having children and there was no fear of attachments. No Jedi celibacy except in the Rough Draft 1974 screenplay.

Lucas was thinking Buddhism with Yoda though.