I'm going to go with pullet. Don't shoot me if it starts crowing tomorrow, but out of something like 30+ Silkie cockerels from the feed store in one summer alone, by 3-4 months every one of them had much more pronounced combs and was crowing. There was one lone pullet in the bunch. By 3 months it was obvious all the rest were cockerels. At least a third of those were even crowing at 2 months. Yep, our neighbors really loved us that summer.