You know that when you let him out, he'll probably be more "vigorous" at first, right? He'll have been separated, hormones working, and need that release. Do you really need a rooster? Are you planning on breeding? If not, I would suggest a hens only flock for you. Then you won't have to worry about the wear and tear on your hens from an over active cockerel. I think he'll likely settle down as he gets older, but it's your choice entirely. I have never separated an active cockerel from my flock. I guess it just never occurred to me to do so. But my chickens have always free ranged, so maybe the hens have had a chance to get away from the cockerels as they were going through that hormonal stage.