Okay, here’s my theory. There’s a big showdown in the guts of the Death Star, all the Force Ghosts are present, everyone’s about to be blown up or something, and then Kylo has a big change of heart and self-sacrifices so that his beloved Rey (and co.) can escape. As he does so Palpasnoke is screaming “no, you are Master of the Knights of Ren!” and Kylo - just a Leia’s theme/Force theme mash-up swells - says “I am a Skywalker, like my mother before me!” before going kaboom.