^ yup , George Lucas contradicted himself a lot back then , but he also had the final word on plot points , which is a big reason Gary Kurtz walked away . Now , the story is a relay race in the hands of multiple directors and the Lucasfilm story group . another great book to read for info on the films are the making of books by Rinzler , The Making Of The Empire Strikes backs has parts of the early script by Leigh Brackett where Luke’s father ( not Vader ) comes to Dagobah and has Luke take the Jedi oath with Yoda and Ben watching .