"Zimmer’s defense isn’t your grandmother’s 4-3. It’s constantly evolving based on the personnel, and constantly trying to amp up pressure by creating mismatches with an array of stunts and bluffs...
They might load eight in the box, appearing to bring a heavy blitz, only to throw the quarterback a curveball by rushing the corner from the slot side and rotating a safety from his pre-snap blitz position to fill the vacancy. They might fake an inside blitz, leaving interior blockers searching for someone to hit while the quarterback gets rolled up by edge rushers"