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The Bills secondary held Dolphins quarterback Chad Henne to just 182 yards, and didn't allow a passing touchdown, and contained the elite wide receiver Brandon Marshall to just 53 yards.
Leodis McKelvin played exceptionally well, making three tackles and defending two passes. He replaced Terrence McGee in certain situations throughout the second half and looked solid against Marshall.
The Bills will need exceptional play from all of their defensive backs, considering that the Packers are often in four or five receiver sets, consisting of playmakers Donald Driver, Greg Jennings, Jordy Nelson, James Jones, and Jermichael Finley.
The Bills are especially deep with talented players in the secondary, and you can expect to see a lot of nickel and dime formations, with McGee, McKelvin, and Drayton Florence all expected to see significant playing time.
The secondary didn't make an interception last week, despite ballhawk safety Jairus Byrd getting 32 reps.
Donte Whitner really needs to step up on Sunday, as he will be crucial in coverage as well as stopping the run.