Brandon Carr and the Cowboys are just one of four struggling defenses in the NFC East. (Matthew Emmons/USA Today)
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The Post Sports Live crew took a crack at this question, but we might as well ask you too. If I had to simplify it, having seen all four teams play, I’d say bad defense.

The Giants, at 26th in the league, are the best of the bunch. The Cowboys, by yards allowed per game, check in at 30th, the Eagles 31st and the Redskins dead last. Dallas and Philadelphia have had the misfortune of facing the Broncos, and Washington played the Packers. Still, the defenses aren’t so hot. Any guess as to why?

Kent Babb wrote today about the Cowboys’ defensive struggles as they switch from a 3-4 to a 4-3 under Monte Kiffin. The Eagles switched the other direction, and brought in a bunch of new players, so that makes sense too. The Giants, maybe they’ve gotten old, but so many of their key defenders (Jason Pierre-Paul, Justin Tuck, Mathias Kiwanuka, Antrel Rolle) are still on the roster, so that one’s harder to figure out.

The Redskins’s defensive struggles you know about. The Outsider, Mark Bullock, showed how compensating for weakness on the back end was hurting the run defense, and how Washington has fixed it against the Lions and Raiders. The Cowboys will be a test more like the Packers were, with multiple players that can get open downfield. Shut down the run, and the defense has a chance.

What do you think? Can the Redskins stop the Cowboys? And is something else behind the NFC East’s collective struggles?

Here’s the PSL crew:

The Post Sports Live crew offers takeaways from the weekend's NFC East games and also look at whether the division's poor play means there is a still a shot for the Redskins to make the playoffs. (Post Sports Live/The Washington Post)

Have a Redskins question? E-mail Mike Jones at mike.jones@washpost.com with the subject line “Mailbag question” for him to answer it in The Mailbag on Tuesday.

What’s ahead:

● The Redskins practice at 1 p.m., and both Robert Griffin III and Mike Shanahan speak with reporters.

More on the Redskins and NFL:

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Outsider: How the secondary moves have helped the run defense

Mailbag: Do Redskins have any interest in Bills’ Byrd?

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