If I were back at school writing a story and the teacher polished up the spelling and gave me some ideas it would still be my vision. However, if that teacher took it home for a week and wrote pages and pages of story and invented characters, it would no longer be my vision. Infact, if a teacher did that for a major assignment at school or Uni, they would be in big trouble and the work would not be considered the students. It is the same deal with SW. Lucas isn't getting anyone to simply polish his work. He has, in the past, got them to direct it, write it, invent ideas, compose etc. How is this any different from the example above?