Though it seemed that Niimi was Serizawa's right arm acting with him together, Niimi didn't participate in the group at the Osaka wrestlers brawl incident and the Yamatoya fire attack incident which Serizawa caused, therefore it is unknown how close they were to each other who were both the senior leaders and from Mito, and also how they acted actually as the leaders of Mibu-Roshigumi.
新見は芹沢と行動を共にする腹心と言われるが、芹沢が引き起こした大坂力士乱闘事件や大和屋焼き討ち事件には参加しておらず、同じ水戸出身の最高幹部だが芹沢とどの程度の親密な関係だったか、また壬生浪士組幹部としての行動の実態はよく分らない。