Bernie Williams and Jorge Posada, two core Yankee players from the Joe Torre era, are long gone. Mariano Rivera, another quiet leader by example, is retiring after this season. Andy Pettitte is near the end. And the Yankee captain, Derek Jeter, won't be back in the lineup until who knows when and is nearing 40. Leadership used to be a huge piece of the Yankees' winning puzzle. That leadership is dwindling away.