Dark horse Kotoshoho overpowered fellow championship contender Aonishiki to win the Nagoya Grand Sumo Tournament with a 13-2 record on Sunday.No. 15 maegashira Kotoshoho came into the 15th and final day leading young Ukrainian sensation Aonishiki and top-division debutant Kusano by one bout, with the Emperor's Cup guaranteed to go to a first-time winner from among the rank and file at the new IG Arena.Determined to avoid a loss that would force him into a championship-deciding playoff, Kotoshoho opened with a solid shoulder blast and thrusted Aonishiki (11-4) to the clay as the No. 1 maegas…READ FULL ARTICLE