Indeed the sword can do everything by itself Zoro is just decoration, you though Zoro was figint all this time, but it has always been the swords controlling him.
People dont kill people, their weapons do!
Arloong killed Nami's mother? NO, the gun did!
Blackbeard killed WB in marineford? NO, their guns and weapons did!
Caesar killed Monet? NO, his knife did!