I have 4 coops with at least one rooster in each. Years ago I had an English lavender Orpington rooster and a Jake that hated each other. I had to keep them separated. One spring the ground thawed and the poultry net fell out of the mud on the north side. I seen that rooster hop and start walking to the south... where the jake was. By the time I got my boots on and out the door, the jake was tap dancing on the rooster. At dark He's hens that seen the death went in the coop rather depressed. The hens that didn't see were calling and calling.It's interesting that chickens don't seem to be able to register that the dead body of a chicken was their friend. It's like they only recognize them in life. But they certainly understand and feel the absence of a friend.
After a few days they left that coop. The hens had been in different coops before I separated for breeding. For the most part they went back to the coops they came from on their own.