I agree with points from Eddie. If I say some things that already made by him, my apologies.
The grand scope of things, it makes since to make it as consistent as possible. Of course, there may be things that just CANNOT be fixed, at least in a quality-councious way. When it comes to this, some of it will have to fall under the “Point of View” philosophy. Granted, there are things that stretch that too much, and others ok.
For example, when it comes to Obi Wan in a New Hope that seems to contradict the Prequals, I am ok with that myself. He was pretty much hiding things/lying from/to Luke anyway. And some of his statements can fall in line with the “Point of View.” However, the scene with Leia remembering her mother COMPLETELY makes a plot hole. Personally, I would be ok editing that scene to remove that. Simple fix. Let’s be honest, that whole scene between her and Luke was a bit of a mess that needs some cleaning, which even Adywan will be looking at that for his edit.
I will say, in my opinion, not worry too much on the current Cannon or other shows. The focus should be on the “movie” cannon. Granted there have been good additions, such as characters/plots from Clone Wars, some comics, books, etc. But that would just add distractions. There would be things that would be too much work to try and make it work that affects the quality.
All in all, at the end I think the collaboration should focus on the quality of the movie. Essentaily a person watches it and believes it was something that was from Lucas/Disney. I appreciate some peoples fan edits where they make BIG changes and do their own shots/cgi/etc, but it isn’t polished.
That’s my two-three cents.