Usually, if Williams wrote music for a scene, it’s probably best to stick with what he wrote for that scene, or use nothing at all.
Thing is Williams wrote for a scene of Rey standing menacingly.
Now we have the triumphant return of Obi-Wan & Anakin. And having Luke & Obi-Wan in the scene burning homestead even works as a callback to Luke’s own embrace of the Force as well bringing both journeys full circle.
Palpatine gets incinerated like Uncle Owen & Aunt Beru and the Sith Eternal are like the Jawas dying collaterally.