Why Rams' Scheme Change Won't Affect Aaron Donald/PFF

Why Rams' Scheme Change Won't Affect Aaron Donald/PFF

With Wade Phillips in as the Rams' new defensive coordinator, Sam Monson explores the impact of a defensive scheme change.

By SAM MONSON

Nothing causes hysteria and concern among a fanbase like a new coaching hire that brings with it the prospect of a change in defensive scheme up front.

This offseason, Wade Phillips was let go as defensive coordinator in Denver following the head-coaching change there, and was quickly snatched up by the Los Angeles Rams, replacing the departing Greg Williams in the same role. That means a switch in scheme for Los Angeles between 4-3 and 3-4 defensive fronts, which immediately raises questions about whether the Rams have the personnel for that change, and what it means for star defensive tackle, Aaron Donald, a player that has ranked first and second in PFF’s Top 101 player list over the past two years, respectively.

The answer to that last question: almost nothing.

In reality, there isn’t much distinction between 3-4 and 4-3 schemes today the way there once was.

When the 3-4 was first in vogue back in the 1990s, it was a two-gap system, where giant behemoths on the D-line played head-up over their blockers, defending the gap to either side of them and occupying space for the linebackers behind them to make plays uncontested. 4-3 defenses were typically one-gap schemes with smaller bodies up front that attacked gaps and won with penetration, while the 3-4 was a system where the linebackers, not the defensive linemen, were the stars, and the big bodies up front controlled multiple gaps without overcommitting to either one.

3-4 2-gap

Today’s 3-4 defenses are very different animals, and predominantly one-gap systems, just like the 4-3. The NFL is generally a one-gap league these days, and there is very little two-gapping deployed as the league has trended towards smaller, quicker players across the board. Gargantuan nose tackles of the past like Ted Washington, Gilbert Brown and Grady Jackson have been eased out in favor of more athletic players that can move down the line, rush the passer, and not just occupy space. Sub 300-pound defensive tackles are not uncommon, and you will even find 3-4 nose tackles that barely tip the scales at over 300 pounds.

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