Yeah, I really believe he'd pass that trait on, and it's very cool to see.
I've seen LOTS of snakes with side belly marks, and even a few that it was across the whole belly. But I've not yet seen one like him, where the sides of his belly are white, and just the center was marked.
If I can scrounge up the $75, I might just go back and get him. I bet he'd make some nice babies crossed to pastel or even Mojave.
Gale