It's very difficult to run Seattle's defense in College. You know who'd agree with me? Pete Carroll, who moved away from some of the things they do in Seattle while he was at USC (with pretty darn good talent available). Maybe we'll adjust, too.
This will turn into a ridiculous thread now. So, proceed.
Other than pressing in cover 3, which is unique, what did they do differently? I know they messed with fronts but they always played with a big safety down in the box and in that middle zone (Bing, Mayes). They didn't do very much blitzing either and either do the Seahawks.
Seattle is a base pattern match Cover three, with press corners.
USC was a base cover 1, no pattern matching principles. Much much easier to get kids playing fast, early on, not thinking, and of course, mastering technique instead of scheme.
Seattle runs a multitude of fronts and has different players playing 2-gap while others 1-gap on the DL. While their "base front" is the Monte Kiffin inspired Under front, they play a significant amount of over, and bear. In their over front alone, they have various little quirks: red Bryant, at 320 lbs, while line up heads up on a TE and play both C and D gaps. Their 3 tech DT will be a one gap and hold player. Their nose tackle will tilt and be responsible for both A gaps, and their WDE (Leo) will align in a 9 or 5. Then they'll flip the ends, and align Red Bryant head up on the weakside tackle defending B and C gaps, the two interior guys are the same, and LEO now becomes a 6 technique heads up and slants inside. This is one front, with slight tweaks. They didn't do anything this complex at USC, let alone ANY two gapping.
Their 3rd down package is also quite extensive.
Aside from the under front itself, the idea of boxing instead of spilling, and the titled nose, Carrolls new system is not much like the tampa-2 at all. Totally different skills required for nearly every position.
USCs scheme was a heavily watered down version, the single high safety/under front version of Randy's man-2.