Um, almost right. Males do end up lighter, but that's because they get TWO barring genes. (Twice as many genes = more white = lighter color.)
Male chickens get a matched pair of sex chromosomes, female chickens get a mis-matched set (backwards of the way people are.)
I am watching this thread with interest, because OP is tracking individual chicks--including order of hatching. Years ago, I hatched sexlink chicks and noticed that most of the females hatched first, then a few of each, then a bunch of males. So I have a theory that females tend to hatch earlier, and I'm interested anytime someone's chicks might support or refute that theory of mine.
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that’s really interesting as both my hatches have had what we think are the girls hatch first!Their only 3weeks and a few days old so will need to wait and see.