Sean Marks signed his termination papers Tuesday. No, he didn’t resign, although he might’ve been able to salvage whatever professional dignity he has left if he had. But the general manager will be the next scapegoat to be pushed off the Nets’ ever-splintering gangplank. He has to be, if only because of the logic of professional sports. Rule 1: An owner can’t fire himself — even though Joe Tsai is tied at the hip to Marks, and so everything Marks says publicly clearly comes with Tsai’s stamp of approval. Rule 2: You can’t fire the players. And the fact is...