silkie mix

Ok.. One of biggest mysterys is the gender.i have two silkie roosters just started crowing this week and it still is not crowing, back even though its older than the silk roos.. The comb would it be showing something larger by now at this age?

We have three silkies we need to rehome. One is a partridge and two are black silkies. One of the black silkies is a mix and has a single comb and is big for a silkie. We have had them since January and they were 8-12 weeks old when we got them. They have two extra toes instead of the silkie...