Ok. I have seen pictures of Barred rock chicks (5 weeks old) and all of my chicks look normal. One of them named Jet is not getting his coloring. He is pure black, with white wing tips and slight barring. Very, very faint. I believe he was the one who got sick when he was a few days old and he is a runt. Is this coloring thing normal? Or is it just something about him specificly?