I wondered if the rough feathers might be molting? If I just saw the pictures with no age attached, I'd say 10-12 week cockerel. The only thing making me think pullet is the stated age.
And now that it's pointed out, I see the skin color is wrong for Cochin, too.
Have you contacted the breeder? Do they have Marans or Langshans?
I agree. It's screaming cockerel to me.