The actual state of the negative and whether or not there are sufficient good quality sources to restore the film to its original state lie within Lucasfilm itself.
Of course, we can’t leave things up to chance seeing how since 1997 the entire point of Lucas was to erase that the originals ever existed. They were a rough draft, a work in progress he was forced to release, and he was unhappy with them and so, and on.
It’s completely unconscionable to leave it up to Loc and BFI to have to rescue these movies, as is 4k77 wouldn’t even exist if George had done the right thing.