re: The 3-4 defense traditionally relies in a dominant NG

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There are two different schools of 3-4 defense. I'm no expert but as I understand it, the one gap 3-4 (which Aranda runs) doesn't require a massive space eater at nose tackle.

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There are a bunch of different flavors. Most people think of Belichick's 34, which is all space eaters and the defensive line plays read/react while two gapping.

Then you have Wade Phillips, who one gaps and has actually used relatively small nose tackles. Jay Ratliff is an extreme example of this, dude barely weighed 300 pounds.