If the second is true, then it's still not that appealing (in general, I'm really not pushing for a Kylo is redeemed arc). Kylo's had his chances - he had it with Han, he had it with Rey, he had it with Luke, and every time, he's embraced the Dark Side. To get redeemed now wouldn't work either from a narrative standpoint or from in-universe justification. I'm not against Kylo having regret for his actions or whatnot, but I'm not fond of the idea of him being full redeemed. Like, even if he dies like Vader, don't bring him back as a Force ghost for some warm and fuzzy feeling.