Like many fans out there, I am hoping that Kaio breaks Takamiyama's makuuchi record.
Since Takamiyama was not an Ozeki (with the attendant pressure to retire upon demotion due to two consecutuve MK), I wondered what rank Takamiyama was when he retired. It turns out he was demoted from makuuchi to juryo, and fought two bashos in the lower division.
So if Kaio were to retire at a similar rank, in many respects he has already beaten Takamiyama's record. So long as he continues to fight even if he does get demoted, he will easily go beyond 97 bashos, and most likely at least 100. Of course, his Ozeki pride probably means he will retire if he is demoted - so we hope for a couple more KK to seal the deal.
While Chiyotaikai owns a very undesirable record by going 2-13, the record of the most kadoban needs to be put in perspective. Because he has over 10 YEARS at Ozeki, he has had correspondingly more 'chances' to go kadoban. I would be interested in the RATIO of kadoban to bashos at the Ozeki rank - I suspect he may fare better on that scale (I wonder if anyone has figured out that statistic).