That is a lot of white, would vote possible cockerel right now if BR and that is a big head spot... does s/he have pink/white bottom feet, or are they yellow (can't really tell from the pics) could also be a Cuckoo Marans maybe?
I'm trying to remember what my BR pullets looked like at that age...I think they were darker. It is possible to have a lighter pullet, but I would guess cockerel right now.
I can see the pictures now (before I was looking at the reduced versions on the side) and I'm going to change my guess to pullet. It has dark legs, which is (usually) a pullet trait.