(Kevin Hoffman/USA TODAY Sports)

The Buffalo Bills were No. 5 on Pro Football Focus' top CB groups

The Bills have one of the best CB duos in the NFL and have quality depth.

Pro Football Focus ranked the top 32 cornerback groups in the NFL, and in no surprise the Buffalo Bills were rated highly. Led by Stephon Gilmore and Ronald Darby, Buffalo's cornerbacks were listed at No. 5 on PFF's list. The analytics site praised Buffalo's top duo and predicted that Buffalo's nickel cornerback job could change hands in 2016.

5. Buffalo Bills

Top CBs: Ronald Darby, Stephon Gilmore, Sterling Moore

Key stat: Darby and Gilmore combined for a 5.1 coverage snaps per target mark in 2015.

Rex Ryan’s aggressive scheme puts a lot of pressure on his cornerbacks, and unsurprisingly, both Darby and Gilmore were among the league’s most-targeted corners last season (tied for fourth-most) on a per-snap basis. Both stood up to that examination well, and Sterling Moore should provide an upgrade—if he wins the job—over Nickell Robey at slot corner. Robey has allowed 1,041 receiving yards and a passer rating north of 100.0 over the past two seasons combined.

Buffalo's starting duo is among the best in the league and new additions such as Moore, Corey White, and rookie Kevon Seymour will add depth to the unit. Seymour has been praised by Rex Ryan early in OTAs as being a potential steal for the Bills. 

The Patriots cornerbacks finished fourth on the list with the Jets coming in 18th and the Dolphins being ranked 31st in the league.

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