I knew a guy who had a Rosecomb Bantam rooster and a big Wyandotte rooster. I warned him about it, but he didn't listen. He would let them range together with their own hens. He lived on 5 acres. He had no problems besides an occasional challenge between the two for about a year. One day he came out of the house and found his big, handsome Wyandotte dead from being spurred by the Rosecomb. This is why I have always recommended 1 rooster per flock of hens with their own pen and coop, and rotational ranging between flocks. I've had all sorts of know-it-alls argue with me on this subject. I'm sorry you lost your little buddy. Everyone, including me, have learned the hard way at some point, and we are always learning.