FRISCO, Texas -- Sean Lee is 33. The yellow, purple and red bruising on his left arm is the product of a partially torn pectoral muscle suffered around the midway point of the Dallas Cowboys' season. A thigh injury makes it difficult for him to walk.
Yet he fights on.
He is in the final year of his contract, and nobody knows how much longer he wants to play -- or can -- but moments such as this Sunday, when the Cowboys play the Philadelphia Eagles in a de facto NFC East championship game (4:25 p.