An 86 implies he is talented, can bust his way through numbers of men when required and has no real fear of the battlefield normally (unlike GHM, RSJ etc), but he isn't someone who specialises in it. He relies on his brains more than anything. That appears to fit in with his character which seemed a bit cold, maybe distant. He's rather retreat and dictate the flow of the battle.
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The martial hype is legit.
And Hakuki's overall hype/portrayal is insane. He was the member of the Qin 6 Renpa hyped up the most and the Six Generals as a group are already considered legendary enough. This is consistent with what we read in chapter 673 : discussion of the Qin Six system revival, mentions of the old ones, Hara giving Hakuki the most hype.
Pretty insane when you consider the level of respect and fear Hara gave Ouki. All of this put into perspective the kind of monster Hakuki was.
He's a damn monster but as far as a comparison with Ouki, I think Hakuki accomplished and was feared more because he was older, therefore was able to do more damage to china since he had more time, whilst he also had the Chouhei massacre attatched to his name which is the most iconic war of the era.
We don't know his age from an in-verse perspective but given how famous he was IRL, and how Hara does tend to be quite straight with the icons (Renpa, Riboku, Gakuki, Ousen), then we can guess he was a GG around the first coalition war. Ouki probably was not, given how he was to marry Kyou.