Defensive line -- 1. Ravens, 2. Bengals, 3. Steelers, 4. Browns: The Ravens' upgrades on the defensive line didn't get as much pub as the offseason overhaul at wide receiver, but the team put a major emphasis on reinforcing an aging unit with Cory Redding, Terrence Cody, Art Jones and converted linebacker Paul Kruger. The Bengals, the division's only 4-3 team, have talent, too, and early-season sack specialist Antwan Odom returns from injury. Age is a concern for the Steelers.