Our two Rooster do have cock fights most of the time many months ago. Now our Jr Rooster beat up his Father he is now the alpha Roo and keeps his father in line. Ours is getting better where Jr will just run his dad around the run for a short time. If Jr wants in the area of the run he chases him to the other side. Jr has all the girls Hens. Rooster tries to tag the hens when Jr is not watching.
With four Hens one Rooster is enough. Since you have two your going have to watch for fights among the two. Just maybe yours won't have cock fights. Most all Roosters have fights if you have Hens. I would just watch. Our Jr Roo we have been thinking about re-homing him.
Our feed store here manager re-homes Roosters if you have fights between the two. We haven't done this yet but we know where to go if we do.