Yes, you have worded this well, and I think it's fairly obvious that TA would not have become involved with JA in the way he did, had he not had some narcissistic traits. TA was not modest in his aspirations and as a motivational speaker was definitely not someone content to be in the background.I know this isn't going to be a popular opinion, but...
A family member of mine was diagnosed with Narcissistic Personality Disorder. She was awful to live with but everyone who didn't live with her loved her & couldn't understand when the family decided not to have anything else to do with her. She eventually married another narcissist. When a narcissist gets involved with another narcissist, things get nasty...the hurt each other over & over again for kicks & to one up another. One of them is gonna "win" by hurting the other immensely. When two narcissists get together, it almost always ends up in the death or extreme excuse of one by the other (the "more" narcissistic of the two will "win).
I think Travis may also have had some narcissistic qualities based on the business he was in (pyramid scheme - he apparently felt no guilt about that as he made thousands of dollars off of the people below him?), thought very highly of himself (at least to the outside world), lied constantly as far as the whole not-having-sex/good Mormon thing (essentially much of his life was a lie...my Mormon friends take that much more seriously than friends of any other religion do), and the ways he used (notice I didn't say abused) Jodi. It seems to me like had "a touch" of narcissism but she was the bigger narcissist....and she ended up "winning" the battle between the two of them in her eyes (a battle that included attempting to control & manipulate one another) by killing him.
I am NOT saying Travis deserved to be killed. I'm not saying he had NPD. I'm saying he seems to have some qualities of a narcissist. Jodi couldn't control/manipulate him how she was used to because he could play the game she was playing. But in the end, the "stronger" narcissist (or truer narcissist?) couldn't take it. She couldn't be beat at her own game and had to exert ultimate control over him by killing him.
The "law of attraction" is a 2-edged sword. I am sure it was not accident that they got together. It is tragic that it ended as it did for TA, who did not deserve it.
With TA and JA, two swords clashed, and it became a brutal contest of wills.