I heard there were only a few drafts of the scripts for episode one... Any writer worth anythin edits repeatedly and then someone else edits it. Lucas surrounds himself with brown nosing yes men. It's amazing how bad ep1-3 are, not to mention for a moment Indy jones four :/
if you ever get a chance read the original draft of A New Hope. It is god awful.
It's like a bad remake of Star Wars. It has some things that are familer but then other things are just weird like Vader isn't a Sith he is actually just an Admiral like Grand Moff Tarkin.
Thank god that movie never got made and instead he rewrote it several times.