This chick "could be" the cockerel above. He is in that group so will look similar regardless. I'll check leg color tomorrow and let you know. Genetically he has to be double barred .
Why is that? is he a RB Male mated to some of your F1 hens? that would be the only way, as F1 Male x RB will give you 50% B/b+ males
The chick/cockerel pictured is RB male over F1 female. The other cross (F1 male over rir) aren't out of bator yet