I agree...when I opened the post, it looked just like my little Lucky bird who is 1/2 Polish and has a mom who is 1/2 silkie. I definitely think she is 1/2 silkie 1/2 polish. Check her toes and see how many she has. The comb is all wrong, too. It is black like a silkie, and nothing like a polish. She looks like a real sweetie pie!
Crevecour and Silkie have 5 toes so if the bird in question only has 4 toes I would say that it is slim that it is a Crevecour or a Silkie cross.
Crevecour and Polish have a V- comb and the bird in question has a single comb.
The bird in question I think would be a Polish / Single comb breed cross.
I would like to also add that I see signs of a Silkie in that bird...