I have several roosters - but the dominant rooster was the only Roo at first.. The next rooster growing up became his second-in-command. In the past two years, many more roosters have joined (and left) the flock, but Carl remains dominant. Charlie remains second-in-command.
However, there have been several little mini-flocks (groups) of hens and roosters developed within the main flock; Carl is the boss of all of them when he's around them, but if they move off into an area of the yard where Carl doesn't happen to be for a time, there is a roo in charge of that group of hens. Nobody but Carl or the mini-flock head roo can mount those hens. The other Roos keep "their" hens, but Carl has King's Rights to all of 'em.
Dunno if that helps...but I find it interesting!