Ok, this one took forever because Kotooshu has been stuck at Ozeki for longer than I have been watching Sumo.
Still, this is a Sumo as Science post, so what does Kotooshu’s history show us: I guess the thing that jumps out at me is his ability to get wins despite his high DoS. He is inconsistent against any given rikishi, but he seems to pull it together every Hatsu Basho for a 9 or 10 win kachikoshi.
It seems to me that a good Ozeki should have a DoS in the low 20s. Kotooshu only met the criteria in one of the 7 Hatsu basho I figured (Hatsu 2010). The charts are below
So there’s the hypothesis for a future Sumo as Science… if a good Ozeki has a DoS in the low 20s, what were Hakuho’s and Asashoryu’s DoS scores during their tenure as Ozeki. Any guesses?