Still think boy. I'm seeing what looks to be roo type feathers on the neck in particular and just now starting to show on back. The buff on left is definitely a pullet.
The white is still too washed out to see feather detail..
Pick up the birds, part the feathers on the neck and back to find feathers that are actively growing(called blood feathers, has a thick shaft around base of feather), look at the shape of the feather coming out of these. If narrow with very pointed tip and is super glossy/wispy that's roo type feather. Hen feathering come out with rounded tip, not so narrow and is more solid, not so wispy. Either flat/matte or not as shiny. Compare between the two with red faces and birds like that buff girl in last picture.
by the way, nice stock.