So in your opinion it wasn't a lack of talent and/or execution but more of the defensive game plan and play calling?
Follow this, if I can articulate it well enough to make my opinion accessible. Not meaning you can't understand, but that I may not be skilled enough to define it.
Pretty much the consensus here is that the offense protected the defense in 2014. While there are those who toss out statistics about time of possession and other minutia, the offense scored lots of points and moved the game along with running plays, which normally take longer than passing plays as far as the clock is concerned. Unless the play ends up out of bounds, in a running play the clock does not normally stop.
Using this as a yardstick, one might say the results of the defense in 2014 was beholding to the offense and their success to a degree.
Marinelli surely went into that game with an idea how he was going to defense the Packers.. And since they are, at times, the epitome of what a passing attack is in this era, Marinelli elected to protect his defense from big plays by being conservative and stopping the pass at the point of attack instead of the point of conception.
Stop the ball at the receiver instead of at the quarterback.
So to a degree, the game plan was created to stop a potent Packer team that employs a timing based attack and throws on a rhythm.
However, Rodgers was wounded, and struggled in the first half. To my way of thinking, putting a defender in his face, and knocking him down at every turn would have positioned the team for a better results than playing what amounted to a prevent defense.
Now my personal feeling is Marinelli was playing with scared money. Jimmy Johnson did some of the things in the NFC Championship game during the 1992 campaign. Barry Switzer did in 1995. He went for it on fourth down and did not get the first down. Same as the Eagles game in 1995. But Jimmy was a huge proponent of playing calculated risks for the big pay-off.
In my mind body checking Rodgers against the boards in the first half causing him to think about his injury and not get into any type of rhythm would have been a better attack on the part of Dallas.
The Cowboys lost anyway. So why not push all the chips into the middle of the table and go for all-out.
In a fist fight against a larger opponent, you always want him moving backwards away from your attack. I think Dallas covered up and played not to get hit.
But this is merely an opinion of a fat guy that watches on TV and not some sage poster here who had a hand in inventing football. (That was not a shot at you, by the way)