The Bills have been a team full of defensive players better suited for a 4-3 defense that has been masquerading as a 3-4 for the past two seasons. The main difference is that McDermott's scheme relies heavily on zone coverages from their cornerbacks -- which is a distinct difference from Rex Ryan's defensive scheme.
The biggest problem would be in finding a middle linebacker that's as quick and instinctive as Luke Kuechly was for McDermott in Carolina. While Preston Brown would be better suited in a 4-3 defense, he's not nearly as quick as Kuechly and could struggle in the zone-based coverages McDermott employs.
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