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The Chiefs are now among the NFL's best teams

Jeremy Maclin has been a big part of an improved passing attack in Kansas City. Reuters/Action Images/Paul Childs

When we watched Jamaal Charles' right knee buckle at the goal line in a Week 5 game against the Chicago Bears, it was supposed to be the end of the 2015 season for the Kansas City Chiefs. Remember, the Chiefs were 1-4 after that loss and would have to play the rest of the season without one of the game's best running backs -- the player their entire offense was built around.