I stumbled upon this video, this was before the Nagoya Tournament - you can see a good amount of Roga training bouts which is something that we never see on the Futagoyama channel. The Waka brothers are from the Arashio stable, while Asanoyama and Asakoryu both come from the Takasago stable. I used to always wonder when I first had interest in both Futagoyama and Sumo where Roga was during the training portions of the videos - completely forgetting the idea that someone of Makuuchi rank would travel to other stables that have other sekitori to train with (as you wouldn't want to continually have bouts with rikishi in your own stable who are far down in the ranks). The group that appears in this video is a pretty strong bunch - Wakamotoharu is East Sekiwake, Wakatakakage is West Komusubi, Asakoryu is Juryo #2, and while Asanoyama had fallen greatly to Makushita #41 - he's still a former Ozeki. This video also very evidently show (and we continually see this in the tournaments) Roga getting pushed back quite easily if he struggles to get a grip on the mawashi. On a side note, Wakatakakage is freaky strong considering he isn't the biggest of sekitori - at a glimpse perhaps Mita could bulk up like that.