All right, all the Exegol footage with crackling saber is available here (purple version) :
https://mega.nz/folder/DoQzwSqZ#vaXGT7zMFcK3i1qBnHRJ2gI’ll make available the blue version when I have time for those who are interested.
Great job! I didn’t follow all the discussion, why the blue saber should be crackle? Is it because Rey fix Luke’s broken saber and the kyber is damaged?