The first bird in the first post has a pea comb, not a single comb, so it will be a lot smaller than the comb on a single-combed cockerel. Hatched on September 24 makes them about 11 weeks old if I've counted correctly, for which that pea comb is larger than I would expect on a pullet even with Leghorn blood. I agree with Rhodebar Lover that, in the first post, the first bird is a likely cockerel and second one is a pullet. Keep us updated on that first bird, though!