What is she?!?!

[Sophia Pincheon]

Got this chick along with others from Rurl King. She was marked as a Leghorn and there were others with her, she was around 3 days old and I could tell she was much bigger then the other chick I had gotten and they were all 3 days old. They were Cornish Crosses, Silkys, mixed breeds, and Polish. I know that some of these breeds are smaller, but I have had Leghorns before and they were never this big. The other "leghorns" she was with were also very large. This is her two weeks later. Should I be concerned?

 

[Egg Snatcher]

The big one is a Cornish cross and the little white one looks to be some sort of bantam

 

[Sophia Pincheon]

Ok the big one is supposed to be the Leghorn and the smaller one is supposed to be the Cornish Cross