Dallas' secondary...has there ever been a worse 4-man starting unit in NFL history? Probably not. Carr has underperformed, Scandrick is terrible in coverage, Jeff Heath also can't cover, although he can make Scandrick look like Darrell Revis with his pitiful attempt at "coverage". Morris Claiborne can't stay healthy and he wasn't worth the trade up to get him. All in all, this secondary probably couldn't ever cover the best offenses in college. They are that bad.
It's at least 5-10 YAC before any DB even gets within fart-sniffing distance of a wide receiver. By that time, the WR has pretty much 6 pts. locked up. And don't even get me started on that horrible thing they call a rush defense. It's completely non-existent.
It's partially injuries and partially Monte Kiffin's now archaic Tampa 2 scheme. It's been exploitable this season, and when opposing offenses got the ability to exploit it; they've exploited it like nobody's business.
The 2014 NFL Draft, not a single player from an offensive skill position (sans any OL players) should be drafted by Dallas. It should be all defense with every single one of their picks. Dallas needs DB depth and help, DL depth and help and more depth at LB.
Sean Lee and DeMarcus Ware have been the only bright spots for the defense, and both at one time were out with injuries. Jerry may have backed Monte Kiffin, but he knows this will be Monte's "one-night stand" in Big D. He's not going to be around next season, he just didn't want to come out and directly say that.