My guess is Aramaki stole that black blade from some pirate against he fought like a trophy, Zoro did the same with Shuusui, so... Im pretty sure he didnt know how to use it lmao
Not really any sense in giving him a BB then lol.

Imagine that Oda, in the final battle against the Marin, will create a plot of a super random samurai having his sword stolen, just so Greenbull has a decorative sword.
 
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