I can add the TIE sound coming in softly at the tail end of the lava shot but I don’t want it to draw your attention.

I see the lava shot as similar to a shot in ROTS of an eruption (the one from the trailer). It’s super brief and may not be immediately connected to the location where the characters are. It just sets the environment very quickly.

That’s an interesting and plausible idea, that it wasn’t meant to be Mustafar initially. Even though the castle shot uses Rogue One footage, I think these three shots form a natural progression: Lava as we expect from the planet, Vader’s castle with lava in the background, and a shot of a scorched forest that blends well with the castle shot.

Now that the music has been addressed, I’m liking the three shot version. There’s a little drum sting when we cut to the lava shot that I put there but you can barely hear it, though it felt wrong to boost it to the point that it was audible. Regardless, this feels pretty good to me on the whole.