The mirroring of the Vader Castle does make it seem like its a new shot (along with the removal of Krennic’s ship)

What can also help sell that too is if you don’t use the “whole” clip.

Here is a quick and dirty rough idea if moving the Vader helmet scene towards the beginning. As for the middle of it, I didn’t do anything to it since I wanted to show just the “kylo” footage with Vader’s helmet. Obviously the idea would be to alter all that flashback/imagery/sounds/etc. to fit more on the lines of “Vader” guiding Kylo.

Just super rough idea playing with a bit this afternoon:

https://vimeo.com/418658350
fanedit