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Numbers 6 and 8 are the black stars, and definitely pullets. Numbers 4 and 5 look like pullets based on color pattern. No obvious cockerels in the rest, but they are still young.

Feather sexing is a sex linked trait that only works for birds bred for it, by crossing a fast feathering male with a slow feathering female. There is a reason why hatcheries have to use vent sexing.