ARLINGTON - For the first time in his Dallas Cowboys' career, linebacker Sean Lee has played the entire season without injury.  AT&T Stadium hosts its fourth NFL playoff game for the Cowboys on Sunday afternoon when the NFC's top seed faces Green Bay.  For the second weekend in a row, CHANNEL 5's Joel Villanueva is on the road, reporting from an NFL playoff game in the state.  He previews the Dallas defense and the impact Sean Lee and company might have on Sunday's game.