The shutdown cornerback is nearly extinct in NFL

Pretty good article... and I think this is why Mckenzie has lost his effectiveness as a "shut down" cornerback...



Changes in coverage

The shutdown cornerback is nearly extinct in NFL


I have to thank New York Giants wide receiver Plaxico Burress for the inspiration behind today's column. When he blasted the Chicago Bears cornerbacks two weeks ago, he basically said that Bears Nathan Vasher and Charles Tillman weren't the kind of defenders who worried him. In Burress' eyes, they weren't shutdown cornerbacks. They were products of a system that played to their strengths. It was a comment that eventually came back to haunt Burress -- especially since he did little in the Giants' 38-20 loss to Chicago -- but the man still had a point.

http://sportsillustrated.cnn.com/2006/writers/jeffri_chadiha/11/21/shutdown.cbs/index.html