Following is the summary of what the writer has analyzed.
First, the fight between Hogiri, and the Nagaitoku brothers was not「Single Combat」kept traditionally among Japanese warriors. Nagaitogu could beat Hogiri through 「One on Two fight」, which was against the traditional standards of behavior of Warriors.
Second, the Nagaitoku brothers, who decapitated Hogiri, had to finish their lives by self-disembowelment, but could have a narrow escape from it. That was because a power, Takagi, who was a distant relative on the maternal side , persuaded the lord of a manor and the senior statesmen.
Third, in the late Edo era, warriors couldn't keep their honorable tradition in the course of a change to Meiji era. They deserted themselves and resorted to an expedient to survive. That is, the tradition of warriors only remained in a bluff in the Meiji era. It is said that the warriors' bluff is well and openly described in Nastume Soseki's works.