Not Mihawk. Zoro's ORIGINAL master. And I guess it's just kind of implied. Since Zoro's master teaches everyone katana-styles, the thing he taught Zoro about "being able to cut nothing, or everything" is like EXACTLY part of Hyogoro's explanation for Ryou.
So my takeaway from that is either Zoro's master was from Wano, or whoever taught him was. Either way, it seems to me Wano is the origin of the philosophies Zoro was raised on.
10/4/04 - 8/20/07