Wow, I would have thought Kylo would be more excited at the prospect that HE becomes the master and Rey would be his apprentice after having shown the superiority of the ... (say it with me) ... RAW ... power of the Dark Side, that where Luke was scared of that ... raw ... strength, Kylo embraced it and seeks to mold it, mold Rey, to take her place at HIS side, along with the Sith--just like his Grandfather tried to do with Luke. That would allow Kylo to live up to Grandfather!