Bend but don't break defenses worth their salt are going to function better the shorter the field gets.
That is part of the issue as well. Sure, it was the talent. But the exodus of Carr, Claiborne, Wilcox and Church and a bunch of new rookies is not going to make an appreciable difference if the scheme itself is soft to begin with. Part of this is on Marinelli. I know it is not what people want to hear or even acknowledge, but eventually you can only blame the talent so much. The big plays that Ryan and Kiffin gave up may have been minimized, but teams know they can take smaller chunks that we are conceding with pretty good results. I feel pretty confident in saying that we have probably one of the more antiquated schemes in the league and a good offense will stress it and there is very little built in to respond. He does not like blitzing and wants front four pressure, yet insists on having grinders and scheme-sound linemen, interior pressure only comes from his one stud 5T which is about as hard to find as a true rush right end. People forget, his specialty is the DL and thus far during his tenure in Dallas, that has been the weakest part of the scheme in part because he is and has been satisfied with subpar talent.
Unfortunately, there will be a learning piece with the secondary which gives the defense another pass. Well, just had too many rookies. We will get 'em next year. Or something.