Do you have a copy of the silkie standard? If not, your going to need one. If the bird is fine except for the toe spacing, use it. As long as it does have all 5 toes on each foot, and doesnt have duck foot. If it has more or less than 5 toes on each foot, cull it. If it has all 5 toes, but is missing a toe nail, use it. I have one hen with all 5 toes, but she is missing a toenail on one of her 5th toes, probably got torn off somehow when she was a chick. Single combs, cull it. Red combs, cull it.
Basically at hatch you look for foot dq's, and single combs. If the chick doesnt hatch with feathering to the middle toe, it ain't gonna magically appear later. So those I would sell locally as pet quality chicks. Then you just have to wait and watch how they grow out.