Carlos Ghosn was widely recognized as a hero in Japan for turning around Nissan when it was on the brink of bankruptcy in 1999. Things couldn’t look more different today. Ghosn was recently arrested for financial misconduct, fired from his position as Nissan’s board chairman, and criticized by Nissan’s Japanese CEO for accumulating too much power.  Without Ghosn, the Nissan-Renault alliance is likely to falter — leaving two small auto manufacturers without competitive economies of scale.