Everyone makes their own decisions on these deals. I would not keep him caged in a small situation by himself, just so that I could keep him. I like to enjoy my chickens, and I do not enjoy strife. But that is your decision, when does keeping him, ruin your joy and his, but alive, verses not...
Once they become aggressive, they really do not go back to how they were before. It is a combination of genetics and hormones. Like getting a red wattle, there really is nothing you can do about it. He is NOT the bird he was a while ago, and there is no going back.
I don't think that it was...