ARLINGTON, Texas — With tears in his eyes, Osa Odighizuwa sat in his locker with Dan Quinn’s right arm on his shoulder consoling him. The Dallas Cowboys defensive tackle was in a level of disbelief, the same as his quarterback, Dak Prescott, who sat across the room talking to his friend, backup quarterback Cooper Rush. Having been the head coach of a team that blew the biggest lead in the history of the Super Bowl, at least Quinn, the Cowboys defensive coordinator at the moment, is familiar with “football shock.” He knows life goes on. By the time the locker room was open after the Cowboys’ pl…