First is this story on defenses in the NFL by Peter King of SI.com. It's about the evolution of defenses over the last few years and how they, not the offense, dictate the flow of the game. It's really well done and includes a closer look at Sean Payton and the New Orleans Saints and Rex Ryan and the New York Jets. It's pretty incredible the amount of information these players have to process on each play. The quarterback will end up guessing several times a game on what defenses will do because things are disguised so well. I'd recommend reading the story at SI.com.
Second is this story looking back at the days prior and following 9/11 for the New York area sports teams including the NFL's Giants and Jets and the MLB's Yankees and Mets. There's only a slight Chiefs connection here since they were the team that played the Giants in the first game back from 9/11 but it's a powerful read anyway. Herm Edwards is featured prominently as he was the head coach of the Jets at the time and you can see what he was going through as the team had trouble doing things as simple as conducting a practice after the events on 9/11.