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The 3-3-5 also allows for a seemingly unlimited number of blitz options, whether it's a linebacker on a stunt, safety up the middle or a cornerback charging in from the edge.
"That was kind of the whole intent of this thing when people started: Where are they going to bring their fourth or fifth guy from?" Gibson said. "Everybody in our defense, we have a blitz for them at some point, with the field corner being the exception. Everyone else could come."
Part of what makes the 3-3-5 such a good fit against the spread is that adjustments from the sideline, whether in personnel or play-calling, are often quick and easy because there are so many athletic, interchangeable players on the field.
Where it can get into trouble is against power-running teams with big offensive lines that can push the smaller linemen of the 3-3-5 back.
If the linemen get knocked off their spots, the gaps, which are already bigger than usual because there are only three down linemen, can become larger or filled with 300-pound behemoths, which smaller linebackers and defensive backs certainly don't want to see.
The 3-3-5 also puts a lot of pressure on defensive players to think on their feet.
The defense is designed to allow athletic players to charge around the field and make plays, but it doesn't do any good if they're going fast without a purpose. The players have to know what their assignments are and the tendencies of the offense out of each formation or they'll end up getting burned for a big play.
"You have to be intelligent because even though it makes it hard on the offense, it's more complicated for us as a defense," Wisconsin linebacker Chris Borland said. "You have to be keyed in to your assignments and your adjustments with what the offense shows."
The defense isn't for everyone.
West Virginia ditched it when Casteel left for Arizona, Strong didn't take it with him to Louisville and Dunn, now coaching at McMurray, never turned it into a big-time success.
San Diego State gave up 90 combined points in losses to San Jose State and Fresno State, and Arizona has struggled defensively in Rodriguez's first season -- 111th in total defense at 480.50 yards allowed per game -- though that may have as much to do with the Wildcats' lack of depth as their scheme.
Still, the 3-3-5 can be effective when it's clicking, a novel approach that's tough to prepare for and keeps the opposition off-balance.
In an era when offenses have had the upper hand, anything that keeps teams guessing is worth trying.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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