Raising cockerels often means removing individuals who aren't assets, for so many reasons. I've been there too, and rehoming nice birds is difficult enough! I've killed roosters too, and it's not fun, but necessary, and peace is a wonderful thing!
Mary
Your birds are miserable, with this cockerel being a jerk. Blunt, but true. There's always some drama with adolescent cockerels coming up in age, but injuries are unacceptable.
These pullets (are they all pullets?) deserve to have nice lives!
Having cockerels raised in a flock including adult...