I disagree with Bob and the pass protection was pretty good. Maybe not the league's best, but still pretty good.
Romo was not very mobile throughout the season. Some of the sacks he's shown were against the Niners where Romo said he was 'rusty' and they had to change up the weekly preparation by giving Romo Wednesday's off. He was so bad in that game that many (myself included) thought he was done for due to his performance and the injury.
He then started to get back into form a bit, but then the injury in the Skins game happened. That slowed him down a bit afterward and then he started to regain his strength and some of his old form. Then Free got injured and Parnell just is not as good as Free. Maybe at times in the run game, but Parnell doesn't have the knee bend to consistently fend off pass rushers well.
Also, nowhere in the article does it mention the average length of time that a QB holds the ball for. They have statistics for that and the Cowboys are one of the longest in the NFL due to the scheme. Much easier to not get sacked when your QB is throwing the ball under 2 seconds than when it is taking 3 seconds or in some cames...9 seconds.
I think what the goal should be is to become one of the best O-Lines in the history of the game. The last great O-Line I saw was the Chiefs under Vermeil. In fact, I would actually take that O-Line over the Cowboys' O-Line of the 90's as I think the Cowboys' O-Line was better at pass pro than run blocking. The Cowboys couldn't win when Emmitt was not playing, yet they won multiple times against good teams when Aikman got hurt with guys like Beuerlein, Kosar and Garrett. I think Collins can potentially usurp Free down the road and we could have the best O-Line in the league from here until at least 2018 (knock on wood with the injuries) and our oldest O-Lineman would still be only 27 years old.
YR