I dunno about the NFC context you've referenced.
My point is the offense is really good because they've invested in 4 first round picks on offense since 2010 as well as paid out big contracts to Romo, Witten, T. Smith, and Doug Free (since reduced) and are getting ready to pay out another mega-contract to Dez.
In other-words the Cowboys have achieved what you'd expect they'd achieve on offense with massive investments in first round picks and enormous contracts for their starters.
The defense on the other hand -- the highest paid player on the defense this season will probably the nickel corner in Scandrick. When your nickel corner (or the guy who under ideal conditions is the nickel corner is your highest paid player on the field for the defense, it tells you something.
Well, let's address that first.
The NFC has quite a few teams with solid to very good defenses at it's tops.
To achieve in the NFC, one has to have a very strong offensive line. Period. Without one, one just won't fare well in the NFC. Look at the Giants right now...Eli is going to have a pretty long season unless teams react to keep them in games.
Starting from the lockout year, Dallas had to dump an almost complete offensive line...and then start a rebuild.
There wasn't cap money then, to rebuild even from a secondary level upon that line via free agency.
That first year for Jason Garrett, there wasn't even enough draft potential to build upon. It just floundered with the likes of: Bill Nagy, David Arkin, Phil Costa, 'killer' Kowalski.
On the basis of meeting the requirement for a strong offensive line, if one was also to have a good offense...well, the price just had to be paid upfront. Setting that offensive group had highest priority.
That Demarcus Ware, Jay Ratliff, Anthony Spencer, and Sean Lee all got hurt in a clump, and Jason Hatcher sought his last big payday, just didn't make things earlier...not the planning behind it.
Well, the Piper has to be paid...and was. We now have the, or second youngest offensive line group...but three and possibly four of it's members now project strongly out for at least five seasons...probably, with Frederick, Martin, and Smith, a full ten.
But the offense now stands tall, and makes able to compete in that same, and now very strong NFC.