AUBURN -- The Tigers' switch to a 4-2-5 system, one favored by new defensive coordinator Ellis Johnson, will elicit some significant changes within the Auburn program.

New skills will be accentuated. New expectations will be created at some positions, which will give some forgotten players new life in Johnson's system.

In our first installment of this series, we dissected the idea of using a three-safety system to create serial leverage against the run.

Stopping the run is essential to the well-being of almost any defense. The 4-2-5 system allocates six defenders toward the run with every snap - four linemen and two linebackers. A third safety, which Johnson called the "spur" during his days at South Carolina, is considered a run-defense asset and generally is in position to assist as needed.

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