I have two rouen drakes that have some differences in color and I was wondering if anyone could tell me if one was more desirable then the other for breeding purposes or if it even makes a difference. The larger male is solid grey on his underside and the smaller male has grey towards the front and then bright white in the back. Both their rings on their necks are broken towards the back. Also two of my adult females have partial rings on their necks. Any thoughts????