So the cockerel will eventually calm down? I have a similar situation. My 6 month old marans cockerel was supposed to be female. He is starting to jump at and attack my young children when they are in the yard. I know he is trying to protect his flock, but I can't have him hurt my kids. If I keep him shut up while his hormones settle, will he be more tame?
You have to work with him every day in the same way you would a puppy. Shaping his behaviour, showing him what is acceptable and what is not. Gaining his respect and reinforcing that daily with your handling of him. Just as you shouldn't with a dog, never leave young kids alone with him. And be watchful of any triggers to his attacks, like fear, threat to his flock, etc. Pick him up and hold him every day, establish your authority with kindness. Don't lock him up and just wait for it to pass, because you'll end up with an antisocial rooster who doesn't know how to behave, and who doesn't respect you. It takes a lot of work. He will always have male hormones, and will behave like a rooster. Teach him you aren't a threat to him or the flock, but that you won't tolerate being attacked. Also teach your kids to respect him and his space. And supervise them always around him.