The Rooster is best to keep for free ranging, especially if he's already docile with you. Keep on his good side and he'll take care of your girls. My 3 chicks turned out 1 rooster, just like yours, he got tail feathers first, then neck feathers. At first they all looked the same. He is really pretty.They said, "We half-ass think that's a rooster, but we half ass think that's our green egg layer" They said they have a rooster return 100% guarantee--- now we're trying to decide if we want to keep him or return him for a hen....
Our girls are free range so there might be a benefit to having a rooster but it's also somewhat intimidating