Sounds like you're just looking for a quick way to tell which ones to keep. Since the pea comb gene and the blue egg gene are so closely linked, I keep those with pea combs. It's not 100% b/c of that small genetic chance that the pea comb gene and the egg color gene are inherited separately, but a comb check is a quick, easy way to have a good idea what color egg the hen will lay.
We have an Ameraucana roo and lots of different kinds of hens. A BO/Ameraucana cross, for example, is more likely to lay a green egg if she has a pea comb, even if the rest of her looks like a BO. It also works the same if we have a mating with my Ameraucana hens and my barred Rock rooster. No pea comb usually means brown eggs.
The legs are all over the place, and don't matter.
Erika