Barred rock cross help

[China27]

I had a very successful hatch yesterday. 5 outta 6. Their special to me because we lost their parents recently. So I had one rooster he was a barred rock, and the moms are blue cochin (the two grey with feathered legs), easter egger (grey with puffy cheeks), black cooper maran (two black and yellows).
I know with Barred Rocks the white dot on the head usually means roo. Does this run true is the mom is not a barred rock?

 

[oldhenlikesdogs]

I don't believe you can sex by the head spot when it's a mixed breed. Not positive though.