My head hen and her two enforcers do this. Last year they picked on my big buff brahma. Poor Sass looked terrible until after her molt ended. It is interesting but now that Zoro reigns in the back yard, Precious and her cronies are not doing this at all. Sass tolerates Zoro's attention because it is way better than being jumped three times in a row by the other girls.Last spring my rooster Ray died at the ripe old age of 10+ years. He had a favorite and her wing tops were bare. I was surprised that they didn't heal after he died and that her back looked even worse. I was even more shocked when I saw my top girl chase this one down and mount her. She grabbed her comb the whole 9 yards. I think you are right. one of your girls thinks she is a boy.