I thought it was possible for dominant white to be incompletely expressed? Everything I read said it was a leaky gene. So I thought that made it possible to have areas of black. I think my chicks are gorgeous so far whatever is going on with them.Barring is dominant, so black sex link hens won’t be able to give barring to their chicks since they are not barred. Dominant white isn’t responsible for that coloring, either, as it replaces black, and your chick appears to have some black patterning.
barring I’ve never really looked into but just said that because I know some sex links are made with barred rosters.