PHILADELPHIA >> The Eagles were approaching the playoffs, and Doug Pederson had an idea. He would ask any player with Super Bowl experience to address the team. Then he had another idea: Brent Celek would speak, too. And he’d never been to a Super Bowl at all. “I just told the guys, ‘Listen, these opportunities don’t come very often,’” Celek was saying Sunday night, amid a party atmosphere in the Eagles’ locker room. “Hopefully it resonated with some of them. You’d have to ask the other guys.