Yes and Yes! Loved this article! I've had a few mean roosters mostly in hatchery breeds we've bought. 2 were Black Australorp and both boys were very aggressive, would fly at your face. 1 Naked Neck attacked your ankles, 1 Gold laced Wyandotte and 2 Millie Fleur. I now only hatch my own flocks and if I see any hint of rooster aggression, he goes. We have at least 6 with our hen flocks and "backup fellas" in a rooster coop.
We keep Leghorn, BCM, Lavender Ameruacana, American Bresse, barred Rock and Easter Egger/Olive Egger. After 7 years we just don't have a mean rooster anymore. I keep backup roosters because these boys will fight a predator to save the hens. They are my first level of protection along with our LGD.