That is so true, I have Amerecuana rooster with rose comb but he breeds Rhode Island reds and some of the cockerels that have hatched have had the rose comb while others ended up with straight combs, just depends on how they contributions from both parents joined I would say, the only thing they all have in common is the muffs, as well as the leg coloring, but as i'm not breeding to sell them it doesn't really matter. they are always fun to guess though, as I've had barred rocks and it doesn't look like barred rock that's why I suggested the others, could be hatchery quality which they don't care so much about qualityStraight combs are common on any straight comb breed. There are many chicken breeds that do not have straight combs. Comb type does not coincide with sex, unless you’re cross breeding for that. Someone above said he could be a Dominque, but that breed does not have straight combs, whilst he could just be a poorer quality Dominique, it’s unlikely.