I have had great luck with having more than one rooster in a pen. I normally let a younger one grow up in the pen with the older one already there. There will be some fighting to set who is the main rooster, but most of the time its short and not bloody. If there is blood, all the chickens in that pen will go after it and keep pecking at it making it worse, so I remove the bloody one. Vary few roosters have tried to fight to the death, most of them get eaten, Killer (DH's rooster) is the only one who has escaped the pot for killing other chickens. Gotta let the man have one or two of his own since I got a lot more
Killer stays in his own pen and had been by himself for a year or two before I put a mean hen in with him who was also killing other chickens. I figured that if they killed each other it wasn't a big loss as I haven't been able to get fertilized eggs from her anyways. Well I guess its a match made somewhere cause they haven't killed each other or even fought once.
The hen is a silkie and Killer is a game cross. Good luck with yours