Thanks Arizona Desert & Heather.
I haven't heard any crowing yet, but I'm in the same boat with Heather on the leg issue. I've been looking at the leg coloring too (and examining for spurs). The two that I'm convinced are pullets have a very dark wash down the leg that pretty much covers it, but their combs are much smaller than those pictures you have (they are almost not there at all), and they are smaller birds, which makes me think they might just be younger. The woman who sold them to me did have various hatches - I'm sure of this because she advertised over a few weeks ("I have 6 week old BR pullets" but she placed those ads on April 5 & later April 25 so you know that if they were the same birds they weren't 6 weeks on both dates). Of course, she also advertised "pullets" and that apparently isn't entirely true.
But I read somewhere that the wash becomes lighter as they age, so I'm wondering about that. The other ones have varying degrees of wash, some which look like your pullet on the left. The coloring on the feathers of two is lighter so I'm pretty sure those are cockerels. But then there are a couple where the combs are larger, but lighter pink than the others and the legs look like yours on the left. Argh! It would be easier if I knew the age because yours look smaller than mine, which could be the photo or it could be mine are older. I feel so lost...
Maybe I should just resign myself to the fact that I paid too much for my chicken soup!