The Arizona Cardinals have shown improvement in year one of the Kliff Kingsbury-Kyler Murray era. However, their last-place ranking in the NFC West and 3-8-1 record doesn't reflect that.

Why are the Cardinals not winning games, then? It starts with a defense that has struggled to defend a light breeze.

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The Redbirds are allowing a staggering 426.3 yards per game, good for last in the NFL. Their 351 points allowed sits at 31st, one spot ahead of the Miami Dolphins (377). Their defensive coordinator Vance Joseph, naturally, is looking the part of a scapegoat.

However, he isn't concerned about his job security.

I’m not [concerned]. I’m not,” Joseph said Thursday, via Tyler Drake of 98.7 Arizona’s Sports Station (h/t Pro Football Talk). “I’ve been coaching a long time in this league, I’ve had success as a coach, so I’m not worried about that. That’s not my call. My job is to fix the defense.”

Joseph's defense has struggled. He insists those struggles are just growing pains of the first-year of a plan.

We have a plan here, and right now it’s the first year of the plan. It wasn’t going to be easy. That’s why we’re here, right? It wasn’t fixed (by the previous coaching staff). That’s why we’re here. We’re trying to fix it, and we will,” said Joseph on Thursday, via the Cardinals' official website.

While Joseph has a plan in place, his defense may need to bring results soon. If not, he could find himself fired for the second year in a row, as last year the Denver Broncos fired him from the head coaches position.