In my experience sneaky, low down, nasty, mean, man fighting roosters are mostly the results of haphazard breeding practices.
Grabbing up a shirt tail full of eggs fertilized by roosters and laid by hens whose backgrounds are unknown and setting these eggs is a sure way to get a coop full of unfriendly roosters. The reason is not in his genetic makeup so much as it means that an overly inbred bird will have behavioral issues related to nervousness.
Only roosters thrown from hens who for countless generations are themselves the daughters of calm mothers and fathers will reliably produce easy going roosters. But any easy going rooster can turn bad in an instant if he perceives that you are a threat to his hens. I am not saying that you can't breed an easy going rooster but I am strongly suggesting that the criteria for breeding such a rooster as presented here is flawed. All I have heard anyone admit to is that they cull any and all roosters who don't measure up to their idea of what a calm rooster is. Don't tell me that "rehoming" your juvenile delinquent roosters is not culling those roosters. Any rooster that fails to pass its DNA down to future generations has been "culled" from the gene pool, the reason for that failure is immaterial. Besides that, "rehoming" man fighters also requires you to "rehome" the mother, sisters, and daughters if not the aunts, and girl cousins of problem roosters by not setting the eggs that they produce.
I didn't write this to put anyone down but to try to help you enjoy your chickens more by helping show you what IMHO is achievable in a back yard flock and what is unachievable.
Aggressive hens would be culled as well, if I had any (other than Tiny). I know a Delaware breeder, coincidentally, the one where Isaac came from, who culled an aggressive pullet (shoe-biter, aggression ramping up, not the norm at all for the breed) around the time she sent me the eggs from her improved line.
It is my considered opinion, partly from my own personal experience, that temperament generally comes from the sire rather than the mother. Case in point: my hen with Sumatra blood we call the Tiny Terrorist. She has spurs, bites, flogs, etc., a nasty piece of work, that one. Accidentally, two years ago, when collecting eggs for a broody hen, one of her eggs was mistaken for my blue Rock's and hatched, resulting in my rooster, Deacon. I never wanted to reproduce Tiny because of her aggressive nature, among other issues she has. Deacon's
sire, however, to swing the pendulum the other way, is my Delaware rooster, Isaac. Deacon is the quintessential pet rooster. He has
nothing of Tiny's nature in him. He's lovable, goofy and sweet, loves to be petted. Isaac's male progeny almost always are like he is and they tend to produce same. JMHO.
I do agree that when you just hatch randomly, you never know what you're going to end up with. You have to be a tad choosy and select for traits you want, temperament being one of them.