If the Cowboys and owner Jerry Jones can learn anything as bystanders in the NFL playoffs, it's that defense is what matters.
It goes beyond seeing two of the NFL's most prolific offenses, the Saints and Packers, bounced in the divisional round.
It's about how teams are built and where foundations need to be laid. The Cowboys clearly don't have a foundation on defense with so many holes and aging veterans.
But if Jones wants to dig his team out of 8-8 mediocrity, the focus on the draft and free agency needs to be almost entirely on defense.
Why did Jim Harbaugh succeed in his first full season as a head coach and Jason Garrett didn't?
It wasn't because Harbaugh, who had his pick of teams a year ago, went with the team that had the best quarterback. That probably would have been the Broncos with Kyle Orton. It certainly wouldn't have been the 49ers and Alex Smith, whom many had given up on.
And the Dolphins, who were also interested in Harbaugh, had won a division title as rec...