He has the Columbian gene. Part of what it does is to restrict black to the outer edges of the bird, and prevents it in the breast, wingbow, back and shoulders. The barring can't be seen there because of that gene. Look at Delawares.
Buff Brahmas are buff Columbian. Likely where it came from...
Did you use the "Show Examples" button? If you do, in the center row, 3rd image up from the bottom is multiple laced partridge/brown. I believe that's what you're looking for.