1 is single comb (hatchery) The rest of the combs look right.Have you compared them against show ? Just to see comb type ?
I think my silkies were 13 weeks before I could sex & 1 roo was 15 weeks before I knew he has a black single comb!
I've been studying them everyday lol just to try to figure out. Looking for slight changes.
Mine are 6 weeks today and the breeder chicks are 7 weeks.