For the most part, yes. That is one thing I am working on. That is why I was so pleased to hatch a pretty blue boy with solid yellow legs. The SOP says, about legs on blue Rocks:
Shanks and toes: Male - Yellow. Female Yellow or dusky yellow, yellow preferred. Most of my girls have yellow feet, if you look at the bottoms of their feet. There are a very few that still have white; a throwback to orps, I understand. So I do have the yellow base to work with.
I am in no way, shape, or form, trying to produce show birds. Show birds mean nothing to me. I am trying to breed to the SOP, which is the direction Im going with these shanks. Right now, just being a good CHICKEN (size, laying ability, temperment, clear color) is more important to me. Im building the barn right now; might take me a few years to get to the paint.