Patrick Peterson's impact in Arizona
The former LSU corner and top-five draft pick could make Cardinals' secondary elite
In attempting to implement a turnaround for a defense that allowed the third most points and fourth most yards in the league last season, Arizona head coach Ken Whisenhunt may have borrowed a page from Bill Walsh's defense-building playbook. And in the process, he may have reshaped a porous defensive unit into an elite one almost overnight.
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