DETROIT — It was the calm before the storm. Detroit sports fans gathered inside Little Caesars Arena for the matinee before the main event. The Pistons hosted the Oklahoma City Thunder shortly before the Lions faced the San Francisco 49ers in the evening for a chance to go to the Super Bowl. The Honolulu blue Lions jerseys scattered throughout the crowd made it apparent that fans were ready to cheer on their football team, but there was a basketball game to be played. And despite an obvious disadvantage on paper, the Pistons overcame the odds and upset the Thunder in resounding fashion, 120-10…