there ya go

Is Ari Millen going to be a co-lead on the show now?
Manson: "I wouldn’t say that. Tatiana is such a wonderful actor and our nature/nurture side of the experiment — where clones are raised in different environments, so they can be radically different — is really the Project Leda side of the experiment. The Project Castor side of the experiment is military. That suggests to us that they’re purpose-made. The military is not as interested in variation. We’re not going to ask an actor who’s a new clone to do what Tatiana does.“ (x)