So is the idea that Rey modified Luke’s lightsaber to make it crackle? If so why would she do this? Sounds iffy like people have run out of things to edit on this movie.
Nah, I think idea is that after TLJ where it was broken she tried to fix it (essentially with a leather strap might I add) and some component wasn’t repairable or just because Rey theoretically wouldn’t know how to fix it, causing the blade to be distorted.
Basically just a way to reference TLJ and the broken Saber, plus symbolic representation of Rey’s conflict and Kylo’s past when he is redeemed.
At least thats my line of thinking for it.