At the beginning of Wano, Zoro killed the magistrate. Now was that an official or fan translation? If it was the official translation, then that means Zoro started the arc with murder and he could end the arc with murder!
I honestly don't understand how One Piece power levels and scaling works. I have no idea what low, mid, or high diff means. The fights are cool. I love the world building, adventure, and nakamaship. One of my all time favorite arcs are Water 7 and Jaya.