I free range too, but won't they still fight? And you're welcome to ALL of my cockerels. I only have two right now.
The losers are chased away, not killed, at least by the victors, though being kept on the outskirts of the chicken population is a good place to wind up as fox food. Many of the roos I free range simply disappear, but better options have not appeared as yet. I'm not sure this is optimal, I think I'm selecting for the meanest and orneriest roos this way, but they don't sire many chicks so I guess it doesn't matter. None of the free range roos turn people aggressive, if they do they can be easily caught and dispatched, so we would definitely get that out of the population.