I had no rooster when my hens started laying. They seemed more stressed when I brought them outdoors. They would not walk around the yard as much and would often get scared of something, scream and then fly for 6-8 feet to get away from what scared them.
Since I have a rooster, the hens no longer do that. They seem to feel secure.
At night (I live in cold Quebec) during winter, the big guy was roosting with three females on each of his side. I think he brought a bit of heat and comfort to them.
I don't think he is an aggressive or... aroused rooster. I only have one hen with a slight feather lost towards the tail but the others don't even show sign of any rooster activity. None of the white eggs were ever fertile, so I think the rooster doesn't even bother the 3 white hens. Maybe because he is only about 1 year old..