It looks this this thread has been edited mercilessly, but I would like to point out one thing...
@roosterhavoc - While you make excellent points judging by your avatar picture I'm assuming you work mostly with game fowl? Is it possible that some varieties of chickens English Orpingtons for example, or Cochins have less aggressive tendencies than other breeds? Much like hens in the Mediterranean Class have generally had the "broodiness" behavior bred out of them. I believe that's the point of selective breeding after all. So to say
all roosters are aggressive is probably not the most accurate statement. Rather you could say the roosters you've encountered in the varieties you work with behave in a certain manner. After all we should all remember we wrote the books, not chickens. They change the rules as they see fit just to keep us on our toes.
I have kept multiple roosters together in large breeding flock situations in the past without issues. I have never kept a Bachelor Flock, but I fully intend on integrating the young Silver-laced Orpington cockerel I got this weekend with Sterling the male in my avatar picture within a month so he grows up with my existing rooster as a benevolent overlord. Sterling shows no aggression towards me, any people, dogs, or the pair of geese that live with him. He has only ever hackled when he was staying at a friends while we moved and her four bantam roosters decided to gang up on him. It looked a bit like the last scene in Jurassic World with the velociraptors circling and leaping onto the Indominus Rex. Sterling may have been slower, but he weighed more. The confrontation was settled with minimal damage and they learned their place while he was there.