Last year, we called Chiefs defenders Justin Houston and Tamba Hali the "Best Hope for the Chiefs' Future." We were onto something. As of press time, Kansas City is undefeated, and a big reason is the defense. Houston is the NFL's sack leader, and he's the league's third-fastest pass rusher to record 20 sacks. The only guys better: Chiefs legend Derrick Thomas and ex-KC mullet king Jared Allen. Add a ball-hawking secondary of Sean Smith, Eric Berry and Brandon Flowers; imposing linebackers Derrick Johnson and Tamba Hali; and a barbecue-free Dontari Poe, and the Chiefs' D is looking stronger than ever.