IN my first batch of laying hens, two of the pullets turned out to be roos...they got along fine for two years, then started fighting. The one who'd always been alpha lost the fight. The run was apparently too small for the loser to get far enough away from the new alpha, so the new alpha kept attacking him. By the time I got some help to separate them, the "winner" had injured himself (cut feet, both spurs broken off, toenail torn off) by hitting the fence repeatedly when he attacked the other roo...so the "winner" ended up having to be culled (I had nowhere else to put him).
Anyway - here's what I THINK happened: my two coops share a fence. I had a batch of Freedom Rangers in the adjacent coop. When I started letting them out of the chicken house into the run, they were afraid to come out the doors because the adult birds were only about ten fee away (even though behind the fence, of course). So I hung a tarp on the fence to block the view. The babies came out and after a few days, when they were used to coming and going, I took the tarp down. The Ranger boys were already acting like boys, and two days after I took the tarp down, my adult roos had had their first fight...which ended as described above. I'm thinking that it was the stress of having other birds so close, with roos beginning to mature, which triggered the fight.
I re hung the tarp, but the damage was done, the big boys could not continue to live together in that run. I know others raise roos together, but I think a lot of the reason for success lies in flock management. The roos must not be given a reason to fight....I gave them one, inadvertently, and it ended badly for one of my roos.
You may also find that your hens are very unhappy when the boys grow up...two hens and three roos is not a good mix...I hope you plan to separate the boys from the girls, or you may find that the boys fight because there aren't enough hens, and your hens may end up with no feathers on their poor backs from being bred too much.