I don't want to take away from the resolution of the OP's issue, but I have a very similar problem, with Dark Brahmas, and this seemed more appropriate than starting a new thread. They are almost ten weeks old at the time of these pictures.
These two (call them 1 and 2) I am pretty sure are cockerels, because of the more bare and red faces. (They are also facing off a lot.)
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This one (3) I am unsure of, as it has a somewhat bare face and comb both redder and bigger than all the others (which I'm sure are pullets.) Is this just a pullet with a bigger comb, or a cockerel slow to develop?
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A friend and I split up an order that was supposed to contain two cockerels and eight pullets, but we aren't sure they all came out the way we hoped.