Silkie rooster?

[sophiesflock]

Which silkie do you think is a rooster? They're 7 months old and today I heard one crowing. I bought them unsexed. The black one is more developed but the white one seems to make a lot noise. Help!

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[sophiesflock]

 

[sophiesflock]

 

[Dogue]

That black one is a rooster.

 

[drumstick diva]

Black one is a cockerel, I can't see the extent of comb on the white one- but, think she is a pullet