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That is quite the comb he had at a young age! He has a single comb though, and they're more noticeable than pea combs which is what OP's chicks have.

Uneven and splotchy patterning does often mean its a boy. It'll be easier to tell on that once he/she is all feathered in. For the size, it's not too reliable to sex that way. I've found it varies.

It's really too young to know for certain, a good age to tell is around 8 weeks old. None are obvious cockerels as of now. Only one I'm suspicious of is #1.