Um, I just read that again:
BCM is some kind of Marans, right? Black Copper or Blue Copper?
Marans do not have muff/beard on the face.
Cream Legbars do not have muff/beard on the face.
That rooster DOES have muff/beard on the face. That means he must have something else in the mix.
Also, it...
That kind of feather sexing is based on the genes for fast feathering and slow feathering. it has the same kind of inheritance pattern as barring: if you use the right parents, the daughters will match the father and the sons will match the mother. Otherwise, either feathering speed can happen...
When the mother has barring and the father has no barring gene (not barred), then only the sons have barring (light head spot, white lines across the feathers.) Daughters have no barring. If that is the cross you have, then all the chicks in your photos are males, because all of those chicks do...