Silkies with the barring gene tend to have mottled skin and red combs. It's the bane of those trying to create cuckoo silkies. I had a splash hen that took me forever to figure out what the problem was with her mottled skin. The I hatched eggs from her and a blue rooster and it became obvious when she had blue cuckoo sons and splash ones with the same skin problem. I lost her to a hawk not long after.
And I'm wrong on the pairing results for the silkie rooster to EE hens. I looked up the pictures. The GIRLS had the black skin, the boys had the lighter skin that was more grey. Black skin is a sex linked trait. Since females only get one copy of it anyway anyway on the Z and they get that from their father. The sons get a Z gene from each parent.
Hmm now my brain is in gear some. So I guess that makes black skin incomplete dominant? The chicks are easily sexable by skin color though
In your cross definitely different genetics are at play then. I don't know about extended black being a sex linked trait, I haven't heard that. If it is a variation of red crossed to silver mix that follows the Red Sex link cross pattern.
In my case, my White Leghorn has barring which I confirmed with future generations having the barred gene from her son crossed to solid black hens. My suspicion is that the barring gene hiding under dominant white is what is producing my sex linked chicks because of the suppression of shank color and black feathers in cockerels. The hens/pullets on the other hand have large obvious black splotches and dark shanks with a single gene of dominant white. This follows the method of creating "black sex links" where a non-barred rooster is crossed to a barred hen, but in my case the barred gene is hidden but still obvious in the F1 cross. The boys inherit the barring gene and single dominant white from mom, girls inherit the W chromosome without the barring gene from mom.