Former New England Patriots linebacker and current NFL Network Analyst Willie McGinest likes the versatility the Raiders defense will be able to employ with Irvin's addition.

"He's big strong, physical, versatile, you can play him off the ball, you can cover, you watch Seattle, you can do a lot of different things with him, on third down you can put his hand in the dirt," McGinest said. "It brings a little more to that pass rush, because now you can't slide the protection or double-team Khalil Mack, who is another player that is interchangeable. You can move him around too. I would even put these guys on the same side and run games with them."

The Broncos once again proved that defense wins championship as linebacker Von Miller terrorized Cam Newton in a Super Bowl 50 victory. Miller was paired with fellow edge rusher DeMarcus Ware. The Kansas City Chiefs have built a defensive foundation that has been very effective the past few seasons with Justin Houston and Tamba Hali.