Very nice looking birds. My first assumption would be that they are too young to tell- but after looking closely, Dorothy certainly looks like a young cockerel. The color of his comb is not the reason, though... it's simply the size. I've had hens with very large combs, so it shouldn't always be a definite source of identification, but for the Orpington, Dorothy is a cockerel.
The other two are most likely pullets but on this, time will tell. Best of luck with your beautiful birds.
The other two are most likely pullets but on this, time will tell. Best of luck with your beautiful birds.