I see NO sickle feathers on any of them, but they are still young and one looks to have slower feather development. Slower feather development in the tail usually means cockerel. SLW and GLW are a little tricky until they hit that magic point in development when sickle feathers are apparent. I'm still leaning toward pullet on SLW and one GLW. The first one is still questionable. Wyandottes also get that "green sheen" to the black in their feathers in both cockerels and pullets. The other poster with the "reds" look like either New Hamshire Reds or Rhode Island Reds, they have no "white" feathers underneath and in the wing. RSL have white feather (scattered on wing and underneath) as the original poster's chicken does. NHR and RIR will get green/black feathers in the tail.