For right now, the leash is working when they free range. As long as Elvis the RIR roo is not able to leave the area of the coop, he can graze on clover all he likes and the flock stays within their old range. Sometimes during the day I keep him in a dog crate inside the run just to give the other roo a rest and a chance to get out of the coop. It is not a good solution, but for now it will have to do.
(To lleash his we put a plastic wire tie around his ankle just above the spur, loose enough that it moves freely but too tight to get past his spur. Attached to that is another small wire tie ring that I connect a regular dog leash to. He learned pretty fast how far he can get. He can have at any of the girls that are willing to get close enough, he can graze and he can defend himself if he needs to. I check on him frequently to make sure he doesn't get excessively tangled and don't do this if I am not home.