Kotoōshū managed only three double-figure scores in 2006, and none at all in 2007, only doing enough to maintain his rank. Shortly before the November 2007 tournament he dislocated his right knee in training. Clearly troubled by the injury he pulled out on the 7th day, the first time in his career that he has had to withdraw from a tournament. He preserved his "ōzeki" rank with a 9–6 score in January 2008. In the Osaka tournament of March 2008 he injured his left arm in a match with Kakuryū on the 4th day and withdrew on Day 9 with only two wins. There was speculation that he would be demoted to "sekiwake" in the following tournament in May.