It can all go well until it doesn't, and when it doesn't it happens fast! I too keep a cockerel from hatch to hatch, can be hard to choose! (I have some really pretty ones now) My old guy, Phatass, is well 7YO, he is half bantam, and some of his offspring show that attitude. I always wanted one of his silver splash cockerels (looks like daddy) to be a nice guy, but every one of them was mean. 3 of them teamed up on a black the same age/hatch and tore a huge chunk from the back of his neck. I got there before they killed him, all 3 went to the pot, and the black guy, he is over the flock. He has a huge scar, but that does not bother me, nor the girls.