That was a nice story, Barb, and I won't try to argue that you and Jeff can't characterize these cowboys however you want to, for whatever reasons make sense to you!
But I see Jack as the mature parental figure: patient, nurturing, steady, protective. And when I look at Ennis, I see an adorable, sad, poignant, vulnerable, confused, needy 19-to-39-year-old. Yes, he's stoic and Marlboroish, but those qualities seem offhand and natural in him rather than developed through experience. In fact, it's the conflict between his vulnerability and his stoicism that makes Ennis so appealing.
In high school, we used to talk about how in any couple one person or the other is always "the baby of the couple" -- the one who gets catered to and protected and indulged and sheltered and fussed over. To me, Ennis is the baby of the couple.
And I would love to have him as my baby! On the other hand, if he wanted to be the protector and beat up some slop-bucket-mouthed bikers on my behalf, that would be OK, too.