Got up today and checked the broody. Seven eggs have hatched out of the eight. All the chicks are dry and walking around so I know they hatched yesterday. My broody is amazing - I love her! The one remaining egg is the legbar and I would guess it will never hatch. It has until tomorrow morning and then I'm tossing it. Will post pics of the chicks later.
I, too, have wondered about the black chicks with the white spot. I had eight hatch in November. Four had white spots. All of them are cockerels (I think at this point). One of the chicks with the solid black head is also a cockerel. The three black chicks that hatched yesterday all have white/yellow spots on their heads. I hope they are not sex linked!!! That would mean my hen has produced 6 cockerels out of 7 chicks. Maybe my luck is really that bad...