I'm thinking it's another move due to health reasons. This has happened a few times in the past, Flex Wheeler being one of them. He sat out a Grand Prix show for some reasons unknown, but prior to that he was in the hospital due to health problems. I think this was after the '02 O, but I'm not sure of that. Next thing you know, he's retired and it's due to his kidney problem. But it's not related to the diuretics or the steroids used in the past (at the time).
Maybe the latest rumors of Kai being in ill health are true? Who knows. When a bodybuilder tells the truth about things, is the day a snowball lives through its journey the fiery depths of hell.