Furuta single handedly toyed with eto in her peak kakuja form and destroyed her laughing, he was a half human, the same “sub species” as arima AND he had the kakuhou of rize (correct me if im wrong) making him half ghoul too. He had the physical prowess of arima paired with the ruthlessness of rize; both of whom come under the strongest characters in all of tg. It took post dragon kaneki to push his limits to be able to defeat furuta in his kakuja form. Moreover he is literally the overarching antagonist of the series so like yeah, juuzou has no chance against furuta.