Warning: Amature here.
I'll be the odd man (lady)out. Three do have bigger redder combs, but hold on to them a while longer.
Last year I had two buffs. One had a large red cob and thick legs. I was sure I had a cockrell.
The other was smaller and had a yellowish comb that was much smaller. They both were pullets.
Same with my lavender girls the year before. One had a larger, pinker comb, and was thicker. Both were female. I did have 4 males and two females in that group. I almost sold the larger girl at 14 weeks along with the cockrells, but decided to keep her a little longer. Glad I did.
So, not saying they are all female just crossing my fingers for you.