Rustic Rock puller or cockerel?

[mirmbuzz]

I’m back! I bought these three Rustic Rocks as pullets, but one is looks a wee bit different than the others. They are a little more than 5 weeks old.
What say you?

 

[Pigeony]

Usually I would say that I wouldn't be able to tell much without pictures where they're not under red light, but not in this case. Yes, the one with the significantly larger comb who looks different from the others is a cockerel.

 

[Ecarroll]

Definitely the large combed one is a cockerel