I purchased a batch of LCO chicks from Jordan Farms & all turn out to be roosters. ALL 7 of them! Two of them we thought were hens until they started crowing! They did not have the double barring gene. I am not knowledgeable about the genetics at all, but thought I would post this picture for...
I was able to get two pullets by looking at the feathers. If you see barring (white striping), then its most likely a cockerel. Hope this helps. Good luck!