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I had to go back and look again.
What I am looking at is the patchiness of the coloring on the black and white ones. Females tend to have very fine, even patterns, with no big blocks of color on the wings, and I am seeing patches of white on both of yours. However, we have seen a couple of blk & wht pullets on this thread that did have some patches disrupting the pattern, so it's always best to verify by looking at the comb. If you can get pics on the 2 in question, we might be able to tell now.
A pullet at 7 weeks will have a pale or peach colored comb with a single thinnish raised ridge down the center (expected for pea comb). Cockerels will usually have a puffier comb, with what looks like a large center ridge with two lesser ridges running down either side. Cockerels' combs turn bright raspberry pink while pullets usually stay pale or peachy. At 7 weeks, most of the time the comb will start showing in cockerels, but not always. Maybe since your red guy is more developed, he may be depressing the development of the others (this is a theory, don't know if it really happens).
Females and males have spur buds, so you cannot sex them this way. Males don't usually start growing their spurs until about a year old. Keep them til they crow if there is any doubt. I have heard of boyish looking birds grow up and lay eggs!