While I'm going to check out your video, I haven't yet. So without bias from your opinions, I'll go ahead and give my opinions on the list as posted in this thread. Then, after I watch your video, I'll comment based on that. Gee, I'm really being demanding here, aren't I? Sorry. I'm tired. Anyway, to be brief:
For Padme and Qui-Gon, their realized potential was certainly written but then discarded, either on the proverbial editing room floor (because we all know there was no actual film to drop on a floor!) or earlier than that. However, Padme's cut potential of forming the Rebel Alliance... eh, I'm not too upset that that's gone. The prequels were already full of implausible, coincidental oddities (C-3PO, R2-D2, Jango Fett, Chewbacca with Yoda, and the list goes on...) that Padme forming the Rebellion would just have been another kick in the groin. I just hope its deletion removes it from canon.
As for Qui-Gon... eh, he wasn't there, but I feel it worked just as well as it could have been. I read the part of the script where he actually talked, and, honestly, the whole Force Ghost thing didn't seem any more "explained" there than what we actually got. And I didn't mind that he devised it. It didn't seem nearly as asinine as the above coincidences I listed. Maybe it's because Qui-Gon already felt disconnected enough from the OT that it doesn't seem so implausible. Or maybe it's because it's a broad concept rather than a direct event/character, and that's why it doesn't seem as stupid. Then again, I never needed an explanation for the Force Ghost thing at all until Phantom Menace didn't have them fade away. Then again, I suppose I can forgive that with the increased number of Jedi, many of whom were constantly dying within seconds of one another, especially in the latter two prequels. It just would have seemed weird to have a constant stream of disappearing bodies. But with all the things that didn't make sense in the prequels, the force ghost explanation pretty much goes under my radar.
And as for Grievous, he was a total waste of a character. There was no potential to tap in the first place, and the world would have been a better place had he never been invented at all. That damned, irritating, waste-of-space, cliched, inept, non-threatening, unfunny, unsympathetic, uninteresting, poorly-conceived, poorly-directed, poorly-executed excuse for a major villain can suck my lightsaber as far as I'm concerned! Man, I hate that... thing!