The Seahawks back up their front with the league's best and baddest secondary. (Seattle's linebackers—K.J. Wright, Bobby Wagner, and Leroy Hill—have all played well this year, but the Seahawks play a lot of nickel, and the linebackers aren't terribly essential to their scheme. Hill told John Clayton as much earlier this year: "The front four is a lot more important in Pete's scheme than it was in the previous [linebacker-heavy] regime.") No defensive backfield hits as hard collectively as Seattle's does, with Kam Chancellor, Brandon Browner, and mouthy Richard Sherman bruising receivers in front of Earl Thomas, the deep safety. To wit, here's Browner's hit on Wes Welker this week. Browner is a cornerback. He hits like Ray Lewis.

Browner is a cornerback. He hits like Ray Lewis.

Then the Seahawks' line looks like the "wide nine" everyone talked about with the Eagles last year, except it actually works.

A pass-rushing end, usually Chris Clemons, will stand apart from the three linemen and try to beat the tackle one-on-one. The Seahawks call this man the "Leo," presumably because it sounds cool.