In San Diego, coach Mike McCoy hopes an upgraded secondary (with Brandon Flowers and first-round pick Jason Verrett) will allow defensive coordinator John Pagano to take a more aggressive approach. If the Chargers are able to increase blitzing and pressure tactics -- to yield more sacks, turnovers and disruptive plays -- they have the pieces in place to play championship-caliber defense. Kansas City certainly has the talent to be a dominant defense, but coach Andy Reid needs to restore the unit's confidence after a second-half regression and an epic meltdown in the playoffs. Without an elite corner on the perimeter to shut down the opponent's No. 1 receiver, heavy utilization of bump-and-run coverage could be a dicey proposition for the Chiefs. Lastly, coach Dennis Allen is looking to a cast of aging veterans to help the Oakland Raiders become competitive against the potent offenses that occupy the division.