I wouldn't put too much stock in that article. There are lots of folks with all-hen flocks where none of them mount or crow. We had a rooster and when he was removed, the hens had a shake up of the order. Some of his duties are now shared (keeping a lookout on the sky, calling when food is located, herding wanderers, etc.) but never have any of them crowed nor do they mount or dance.
Oh, and one of the hens used to fight him for dominance even though they were raised together. He didn't take the challenges very seriously and she backed down every time. Some hens are just full of themselves.