The reason he isn't upper 4 is that nakime became stronger than kaigaku when she was.

Webhantengu and gyokko died on the same night, kaigaku was probably already upper 6.

Outbreak of war | the seven deadly sins chapter 312 review:

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Examine the arguments and evidence surrounding his strength compared to zenitsu.

Webupper moon six kaigaku explained | kimetsu no yaiba:

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