DominicCobb said:
Personally I don’t really mind that it doesn’t look like Mustafar, just because it’s not mentioned at all, so it almost doesn’t matter. I keep trying to think of a way to just start the movie with Kylo on the bridge of a star destroyer (from the TLJ deleted scenes), then someone says off camera his ship is ready, then we see his TIE flying to Vader’s castle (using RO footage). My problem is, besides the tough VFX work, what happens once he gets there? Ideally you’d just have him go in and take the wayfinder, but when he gets the wayfinder in TROS he’s outside and all dirty and shit, so that footage wouldn’t work.
You can have Kylo’s Tie fly by Vaders’ castle and then cut to him slaughtering the settlers.