The switch to a 3-4 defense

Mamba said

This whole 4-3 vs 3-4 issue is overrated. It’s a throwback to 90s-era football conversation. The game has changed.

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Amen. Some variation of a nickel defense is every teams base defense now. The base defense being defined as the defensive that you run the most on the field. Almost every defense spends most of their time in a nickel defense.