I had two roos, or at least a rooster and his cockerel son, for a while. And they seemed to have an accord. The senior could not manage all 20+ hens so Junior was slowly seducing some away, gradually building a small flock of his own. Senior did not seem to mind and they roosted every night side by side. I did not see overt contention between them until one day I did but nothing too serious, just neck flaring and a bit of jumping at each other, but it didn't last. It seemed more ritualistic than serious so I wsn't too concerned about it. But the next morning when I came out, Junior was lying there dead. I guess Senior'd had enough of that young upstart. Senior was the one that later flogged me so for a while we had no rooster.