Originally posted by SunRazer
Earlier edits had Yoda beating Sidious but deciding for some reason or other to not go through with a victory, IIRC. However, later editions of the script were changed to Sidious being too strong and simply overpowering him (which is what the adult novel's based off), before it was presumably changed back to the explosion at the end.
The early editions had Mace beating Palpatine legit too.
Looks like they originally had Palpatine below the two, then decided to make him the GOAT.