Well if I hatch a few extra males out of my chocos I will let you know! Though my male turns out to be bibbed? When I bought him no bib, after the first moult a small white bib!These were eggs I bought so the parents were a mix of colors.
But I have a chocolate ancona female that I plan to mate with some of my whites and my blue penciled pied drake to see if I can get some chocolate babies.
If I had a chocolate drake I could mate him with my black ancona hens to get sex linked babies!