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This is Pip, the bird in question, at about 5 weeks. I didn't question the gender -- ever -- until someone said, "That's a lot of comb for a 5 week old. And I see wattles starting." That was my first gut clench moment.
I don't think the comb has gotten appreciably bigger in the 10 days since this was taken.
Of the 4 Bielefelders, there are two that are more red, and two that are more grey/dun colored, comparatively. Pip is one of those. Pip was also slightly smaller; not a lot, just enough that you could say, "this chick is smaller than the others."