I personally love the red lightning idea- ties into The Son from Clone Wars and provides a nice contrast to the blue of Exegol.
This is the only thing that makes it interesting to me… but with Lightning being blue everywhere else, and the Son not being in Live Action or any of the films, I think it would simply add confusion to an edit where the goal is to remove confusion and fix plot holes.
I don’t see it as something that needs to be explained, we see Palpatine absorb the power of the dyad and then he steps down in new (red) robes with glowing eyes again. I feel like it’s safe to say the audience would understand:
Dyad power-charged Palpatine = Far greater power than ever before = Red lightning color
The red could just be interpreted by the general audience as maximum Dark side power since red usually means Sith, and TCW fans would appreciate the connection to the Son in the Mortis arc.
The dyad is so barely touched upon or explained that this would only draw more attention to how confusing that plot point is. Doubling down on confusing and unexplained elements won’t simply make it somehow easier for general audiences… all it does it make people throw up their hands and say “nothing matters”.
I like the call back, but even with being in that world, it still makes me ask more questions than it answers. The Son is dead, so is Palpatine becoming the new Son? Are Ben and Rey the new Son and Daughter? Who is the new Father? How will they be kept in balance? If Palpatine absorbs both of their powers and can then use the powers of the Son, wouldn’t the power and influence of the Daughter happen too? Did Palpatine’s spirit merge with the spirit of the dead Son when he was without a body? This also makes me more curious if Palpatine was all the Sith in his life, or not until the Spirits commingled after death? Was it the Sith Cultists that brought Palpatine’s and the other Sith’s spirits back into his body? Why did they not give those Sith spirits into one of their own younger/healthier bodies? With Ben’s death, is there a new Son?
As much as it looks cool and is a nice callback, I think changing the colour of Exegol would be a better change for the film.