too many cockerels

I've got 8 week old silkies, and out of the 8 I hatched most are cockerels. I'll be keeping 3-4 of the cockerels. The rest of the cockerels will be available for free. We're in south central Wisconsin. I've included a picture of the first cockerel to rehome. He has started crowing already.

So most of the research I've done on sexing blue wheaten ameraucanas has said that if they have a lot of darker feathering that means they are a cockerel, as opposed to the pullets who are lighter and less flashy. I know its early at 3 weeks, but do I most likely have a little cockerel here...

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