I have 4 silkie roosters that have been together for years with never any issues,they will chase each other,but there has never been any bloodshed nor any wounds,so yes it is possible depending on breed to keep roosters together.
My orpington boys on the other hand i would not keep together,even though they were hatched together they will still fight,so these bad boys are kept separate to prevent any injuries.
All my birds are confined to pens for their own protection,but i do have several feeding/water stations for my roosters to prevent any bird from not receiving enough,especially one silkie rooster that has been frail since hatch.
I had 2 silkie roos and one hen together for years. Never a problem.
I've had roosters before in the same flock twice in 7 years. Not much. I think each situation is different. I think a good situation can change at any moment.