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That being said, (and I am NOT a pro in the field of the mind/personality) I do see narcissism in CW.
This is why - he appears (from SW's videos, his FB and Instagram, comments by those who know him, the news videos of him, and his confession) to be somewhat introverted, until "brought out" by someone else (brought out by SW for a time, then by his affair(s)).
Covert/vulnerable/hypersentive narcissists often simmer inside, hiding their needs/wants/desires for life until one day it all goes to hell in their rage. I know narcissism isn't a disorder, but a trait we all share, in differing degrees...I believe his, in conjunction with his inner anger, came to a head one day and he lost control...and that, in my view, makes him disordered.
It seems like he may have been acting like many high spectrum narcissists in that he was attracted to someone who had issues that made them vulnerable (SW's divorce and Lupus) and maybe even "love bombed" her, based on her FB posts (she kept giving him reasons to bail, he kept pursuing). She didn't stay vulnerable, she appears to have excelled at life. He lost control of her (if he ever really had it), and he began to lose his "hero" status, at least with her. He may have been seeking to recapture that elsewhere via affair(s).
She, and the kids, were in his way. The classic "discard", to the max.