If Shinki gets more feats. All we know is that he could keep up with Metal Lee in speed, and he can mold his metal sand.
Although those examples are pretty limited since we don't know how fast Metal Lee is compared to the rest of the generation (Like how we first saw Rock Lee and he blitzed past Sharingan Sasuke), nor do we know the extent of his sand manipulation (like Gaara's for example).
I doubt he could beat Shikidai based on these things.
Fan-fic?
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Sixth you debating now? :lol