An external committee of Nissan Motor Co. said Wednesday that concentration of authority in former boss Carlos Ghosn led to his alleged financial misconduct, urging the automaker to abolish the post of company chairman and strengthen supervisory powers of the board.In its final report, the committee also recommended that an outside director lead the Nissan board and that a majority of its members consist of external directors. Currently, three outside directors are among the nine-member board.The committee tasked by Nissan to enhance its corporate governance said it has found that "the prim…READ FULL ARTICLE