What earned Kansas City its 9-0 start, in large part, was a basic formula: Play good, but not necessarily scintillating offense without turning the ball over. Get the ball in the hands of the club’s few playmakers, principally tailback Jamaal Charles. Create a lot of turnovers and convert them into scores. Maintain intense defensive pressure, particularly on the quarterback. Lately, however, the formula has failed. It’s as if some mad scientist snuck into Reid’s lab and removed a critical ingredient.