Both the birds have slate legs, one is just darker than the other. If you ever butcher any of the \"grizzled\" birds just peel back the outer layer of leg skin and you will see there is plenty of dermal melanin. I believe what you have is an epidermis that is thicker or less transluscent, and that is not letting the color show through. Remember, the color is in the inner layer, not the outer layer. I sure wouldn\'t put a priority on culling for that fault alone. There are plenty of other things to be more concerned about. Remember, type makes the bird, color the variety. We sure don\'t hear much discussion about proper breed type - and it is the most important attribute of the breed.