They're marked. I can tell the grey crosses easily as the females are all black with grey peeking through the hackle, and the males with the obvious grey hackle. I'm talking about telling the black females apart from the black males. These two for example are male black grey crossesHad I been you I would have went with a pair from him honestly.
They are good birds, but one needs to cull accordingly with any blood no matter where they came from. No idea why you didn't mark your crosses Tex that'd help ya a ton.