Everyone seems to be leaning towards #4 the mystery bird and I think so am I. I have a tendency toward dark feathered birds. Maybe he is a black sex link rooster? I might keep one of the 3 hamburg's too, they are so pretty!
And I don't think the turkeys are plucking out the roo's tail feathers, my turkeys and chickens completely ignore each other and they are all pasture raised, so the turkeys go one way and the chickens the other. I have had this happen before with chicks from Ideal.... They do eventually come in. Eventually. I raise them on gamebird feed, wonder if that has anything to do with it?