Karusoni

Ah, that makes sense. Anyway, the respective interview can be found on the Nihon University's website.

Correct. The last three double Ozeki promotions involved rikishi from Futagoyama-beya. Wakanohana I himself, then in Hanakago-beya, became Ozeki after a double promotion. The second and third to last double promotions were Futagoyama/Hanakago combinations. The double promotion before those was a Kasugano-beya pair. So not much variety in terms of stables when it comes to the last handful double promotions...

test

Demidjamts is the taller and slimmer guy holding the salt. The guy doing butsu-kari with Hakuoho looks Mongolian too. At first I thought he could be Miyagino's nephew ムンフイデレ (Munhuidere?) who also took part in his danpatsu-shiki along Demidjamts, his teammate in Doshisha. But while trying to find out more about the nephew and concluding it was probably not him after all, I stumbled upon another Mongolian who I really think could be the guy in the video, ダライバートル (Dalaibataar?), who was Onosato's and Oshoma's teammate in NSSU.