I agree with your review. Great Analysis. Don't discredit CGI / FACS fx to generate Carrie Fisher for more movies. She sold her likeness to the franchise (unlike Harrison Ford and Mark Hamill). A young version of her was seen in "Rogue One" along with a CGI/FACS likeness of Grand Moff Tarkin (Peter Cushing). Apparently they got the rights to his likeness also and built an entire movie starring him after his passing.

Carrie Fisher didn't realize she was CGI'd into Rogue One until she saw the movie:

https://moviepilot.com/p/carrie-fisher-didnt-realize-cgi-rogue-one/4227245

Just for fun: Audrey Hepburn in a Dove commercial using same technology:

So she was no longer needed. Maybe she was offed with her Mom for end of year sacrifice to the Illuminati gods. But I digress.

Kylo is definitely Chaotic Evil vs Darth Vader's neutral evil...that makes him more unpredictable and interesting. His inherent belief in his own weakness (sparing his mom, for instance) will make him dangerous if cornered and may make him more viscious to prove himself - to himself.