I got a rooster from a friend who swore up and down he was Black. I kept telling her he was dark Blue. Sure enough, he threw Splash chicks with my Blue hens.
He won't ever be fully laced. Not with one parent being a solid-colored bird that didn't carry lacing. He'd be useful in a project, but I generally only keep the Blue pullets from that initial cross to take back to their laced father to get fully laced birds in the second generation.
He appears to be a poorly marked Silver-laced Orpington. He's definitely got Silver-lacing on one side of the family tree. Without knowing what active projects he's working on, I'd hazard he's trying for Blue Silver-laced, and that cockerel is from a Silver-laced rooster over Blue hens.