One of the top executives of Nissan Motor Co., who took up the post earlier this month, will leave the company, a source close to the matter said Tuesday, dealing a blow to its new management that is struggling to rebuild following the arrest of former Chairman Carlos Ghosn.Jun Seki, 58, who assumed the Japanese automaker's No. 3 post of vice-chief operating officer on Dec. 1, is widely believed to have had conflict with CEO Makoto Uchida, 53, over how to deal with Renault SA of France, Nissan's largest shareholder that had once pushed for stronger ties through a merger.Seki is expected to …READ FULL ARTICLE