Not necessarily,The post from nicalandia would assume that the mother of those possibly female chicks was barred or cuckoo.
E/E, B/B rooster mated to none barred female will yield Heterozygous Barred males(B/b+) and Hemizygous barred females(B/-), the males will still be identifiable from the females, females have a faint barely noticeable headspot, males even with heterozygous Barring(B/b+) will have a larger undefined headspot the will extend to the back of the head area just like your typical sex link chicks..
Black Sex link chick(E/eWh B/b+ chick)