Shinshuiju and Banaji were always on Riboku's side but those two remained in northern region most of the time.
Renpa didn't just matched Ouki but both Ouki and HakuKi at the same time. Also he was like leader of the 3 GH as well. Even in history he was praised as both martial and strategical...
This was said by Riboku himself to his subordinates:
"Nine out of 10 it will be the Wei army's victory. After all if it's a head on clash against Renpa...including me, there is not a single commander alive right now capable of besting him."
Both of Riboku's greatest achievement till now are due to Houken.
Against Ouki, it was surprise entrance made by Riboku's army which affected the momentum otherwise Houken was going to die that day.
Against Gekishin, Ribiku started losing on all fronts than suddenly Houken made his entrance...
Team Renpa is winning this with ease. Riboku can't match the combination of both Renpa and Genpo, who stalled best duo of Qin - HakuKi and Ouki.
Renpa is someone who fights the battle from front so :
Renpa vs GyouUn (mightiest in team Riboku) : Renpa takes this.
Banaji vs KaishiBoi ...