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          How Peyton and Kubiak mix

          Peyton Manning and Gary Kubiak have both had highly successful offensive careers. Getty Images
          • Neil Hornsby, NFLJan 30, 2015, 10:00 AM ET
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              • Founder of Pro Football Focus
              • Contributes regular columns to ESPN Insider
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          At Pro Football Focus, we began providing grades for every NFL player back in 2007. As you can see from the chart on the right, Peyton Manning's rankings among quarterbacks in those grades have been quite impressive, with one obvious concern: