Problem is, you can't see the head spot on the birds at hatch, with that light down. So, you can't tell until they feather out later, and by then gender is usually obvious from the comb. So it's technically a sex link, but what I call an invisible sex link.
So I know there some new faces in there that are 12 weekers but the two from earlier in this post are now much larger, the one with the erect comb I'm thinking may be a roo but the deflated comb I'm pretty sure is a hen. Due to the fact that I found this the other day
which is about the size of a grape and I'm doubtful any of the 12 weekers laid it