The term "yellowbelly" is kind of misleading I think.
This morph does not really have a yellow belly at all. I was so sure when I got my first normal that he was a yellowbelly, he had great big patches of yellow all along his sides right where they meet his belly, hence yellowbelly.
Of course, I learned like you that I was mistaken. But, he's a really lovely reduced pattern normal, much like yours. I love him anyway.
Gale