Very interesting! Not one of them have a dot on their heads..... I am really thinking that he may be sterile - is that possible? I tried breeding him with my cream legbar hen last year and all the babies were from my ameracana rooster! I've seen him mating with the hens so who knows. Its only him and my Isbar rooster out with the girls....
Yes it is possible. I know one lady that hatched from my eggs grew out a gorgeous roo- and he was sterile. I've not had problems myself or had anyone else report that though.