Remember, I’m not English native speaker. It’s always possible that I’m not clear.
I wanted to have a saga that is watchable in episodic order, meaning that the two main plot twists (Darth Vader being Luke’s father and Leia being Luke’s sister) are not stated in Episode III.
In order to make this, we don’t see Palpatine retreiving Anakin on Mustafar. And in Episodes IV and V, noone says that Vader was Obi Wan’s apprentice.

But Return of the Jedi doesn’t require heavy plot changes, because we resolve those two twists in the first act of the movie. So… my ROTJ edit can actually be watched without watching any previous edit. It could work as a single Episode VI edit. That’s all.