Interesting. The Battlefront II trailer released today places Kylo with the The Last Jedi heroes — not villains. Also, we have the first look at how bad — or, how slight — the scarring on his face is. If he had completely turned to the Dark side at the end of The Force Awakens and truly became “a monster,” the concept artists would have disfigured him into something hideous. His flesh would reflect the corruption and decay of his soul, much like Anakin’s and Palpatine’s did.
And that scar is located in the same spot where Han lovingly last touched his son. The murder of Han will scar Ben Solo for life, but Kylo, it seems, will still have a choice in The Last Jedi. And who better to help Luke bring the Jedi to an end than his former padawan who understands the Darkness now. What the galaxy needs is a new kind of Force-user — someone like Revan of the Old Republic who was neither Jedi nor Sith, who understood the Force in its entirety.
As Luke says of the Light, Darkness, and the Balance in the trailer for The Last Jedi, “It’s so much bigger.”