Unsure of breed and gender

[TwistyTW]

Long time no see, chicken loving friends!
I have about 3-4 month old chickens that I got about two months ago under the impression that they were all hens, and leghorn/maran crosses. Now I’m not so sure. One of them (the darker one) is MUCH larger than her(?) sister. I also notice her curled tail feathers, but her comb and wattle are pretty small to be a rooster. Any ideas? The size difference is almost comical.

 

[The Moonshiner]

The one is a cockerel
That cross makes sense with those birds. They would of gotten one dominate white gene from the leghorn. It mostly covers black but not much gold tones.
On the cockerel you can see his gold tones starting to show up. They're exactly where they would be on a BCMs.

 

[TheAlrightyGina]

Yeah that's definitely a boy.

 

[cherrynberry]

Yep the darker one is a male