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Minnesota will host a team that is also being held in suspicion by pundits and oddsmakers the following week, going up against a similarly stout defense and unfortunately familiarly anemic offense.
The difference between Minnesota's play and Arizona's, however, is that there have been a few nuggets of statistical study that indicate that Arizona's success may be unsustainable, particularly the efficiency ratings put forth by Advanced NFL Stats and some of the statistical work by Bill Barnwell over at Grantland.
While Arizona has done a good job containing opposing offenses, it should expect its red-zone defense (which outpaces its defense outside of the red zone) to regress in some ways. Similarly, its relatively high fumble recovery rate—a big part of its wins in the past—should not continue.
Minnesota's strong play hasn't relied as much on random factors rolling their way, but fundamentally sound principles that have led to a good defensive run success rate (seventh in the NFL) and defensive pass efficiency (third in the NFL).
Given that Minnesota's reputation for a restricted offense isn't all that well-deserved (they've been average at manufacturing points by almost any measure), the Vikings should have the edge.
Arizona's offensive pass efficiency and run success rate both rank 31st in the NFL. The injuries to Ryan Williams and Beanie Wells should be further cause for concern.
If Minnesota can continue mixing up coverage concepts like they did in the first few weeks, while also maintaining the safety discipline they've found in the last three weeks, they should do fine. Larry Fitzgerald remains the most important offensive weapon the Cardinals have.
But, Minnesota shouldn't deviate too far from the game plan that allowed them to shut down Calvin Johnson—occasional defensive packages that manned a corner against him while the rest of the defense played zone, while most playing zone coverage with slight safety shades to cover him.
Fitzgerald remains a savvier receiver that will demand more of Chris Cook and Josh Robinson from a technical perspective, but both have been performing above expectations against the better receivers in the league so far.
On offense, Minnesota could potentially find themselves in trouble running the ball to the inside, which is how they've been managing Adrian Peterson's return from injury.
The Vikings should take advantage of the outside zone/stretch runs they deployed against the Titans top open up lanes in the alleys and put Jerome Felton up against the outside linebackers and defensive backs instead of Darnell Docket or Calais Campbell.
The most worrisome threat comes from their defensive line, and Minnesota's offensive line, despite improvements, might not match up. Nevertheless, isolating the outside linebackers in the run game and maintaining control in the passing game should give Minnesota the edge once more.