There was a period of time in New York Giant history when their offensive coordinator was Vince Lombardi and their defensive coordinator was Tom Landry. The head coach was Jim Lee Howell. From 1956 to 1059 the Giants had played in three of the four NFL championship games.
It was said that, inside the Giant facilities, You would walk by the offense's training room and you could hear Lombardi discussing his strategy with the players in a rather "animated" tone. As you walked by the defense's training room, you could look in and see the players in a semi-circle surrounding Landry explaining his strategy using a chalkboard.
Then, as you passed by Howell's office, you would see him in his chair, legs propped up on his desk, reading the newspaper.
I don't care how much effort McCarthy puts into being the Cowboys head coach, so long as it is fruitful, so long as there are enough championships to justify. Any Cowboy head coach could work 20 tireless hours a day, every Christmas, Thanksgiving, birthday, wedding anniversary, children's graduation....I don't care. Unless the Cowboys win championships in a "timely" manner....goodbye, coach.