Two cockerels and a pullet? Whiting true blues

I have three whiting true blues that I hatched, they’re five weeks old. I was so sure that two were Roos and one was a pullet. Two of the had fast comb development while one still has a very small comb still. Now I noticed one of my “Roos” has a smaller comb than the other one and my “pullets” comb is more red! I’m confusing myself 😂 what do yall think?