I watched the vid. Very interesting, and I agree that without the extensive editing SW4 probably would’ve been a pretty bad film. Just looking at the deleted Biggs Darklighter scenes (now available on Youtube) makes that clear: they’re awful. But in Lucas’ defense: he was doing something new, and even after the edits it’s still the story he came up with, just re-edited to make it a lot more watchable and exciting. (And btw, I agree with all of the edits except one: I think Lucas’ original opening scroll was better. It introduces the overall situation in the universe, instead of the severely shortened quick-intro that only provides the story elements that we’re about to see depicted. Depends on one’s preference, I suppose; people with short attention spans would indeed have found the original opening scroll too long to understand.)
As for Lucas’ not having any vision: for the original trilogy, of course he didn’t. I don’t think he knew from the start that he’d be making three films, so how could he have? As for the kiss between Luke and Leia, it probably wouldn’t have been in there if Lucas had meant from the very start for Luke and Leia to be siblings. On the other hand, they didn’t know at that time they were bro and sis, and moreover Leia clearly kisses Luke to spite Han. (Yes, there is the extended scene where there is a romantic lead-up to that kiss, but that scene was removed and so is not “canon”. In fact this removal suggests that by that time Lucas had come up with the idea of revealing them to be siblings.)
Whatever Lucas’ vision (or lack thereof) for the original trilogy may have been, I don’t think it has any bearing on whether he had a vision for the prequel trilogy, which was made over 15 years later. By then Lucas was much more assured of success and pretty much knew from the start that he would get to make three more SW films. So the Darth Jar-Jar theory could still very well be true.