(She) is now 20 weeks old and around 20-30% bigger than the other two of the same age.
The comb is 20-50% bigger than the other two and the noisy one of the three. The feathers on the three look to be the same and the legs size is proportionate to the others.
She has been low on the totem pole but today I watched her face off with one of the others and jump on her back as if to mate.
Hen or rooster ?