The answer is simple. We got blown out by Green Bay last year and in the offseason Jerry allowed a bunch of solid players to leave. He replaced them with lesser players. The team is worse. No one should be surprised.
Look at who left. Tony Pollard, Michael Gallup, Tyron Smith, Dorance Armstrong, Donte Fowler, Jonathan Hankins, Neville Gallimore, Stephon Gilmore. Did I miss anyone? I suppose you could argue that Gallimore was no good, but the rest of these guys contributed last year. The only positive addition is Kendricks.
I understand it is a business and you have to let guys go because of the CAP, but when you replace them with lesser players the team suffers. This is what Dallas is dealing with. If Jerry really wanted to win this year, he should have tried to keep some of these players. Gilmore was available after Bland got hurt. Jerry never made the call. How could he not know this season wasn't going to be a down year? He may be surprised by how bad the beat downs have been, but he can't seriously be shocked that they are losing.