Board Thread:General Discussion/@comment-6192846-20150410215732/@comment-6986530-20150417010023

I believe the Veno novel specified he made the sword himself, not simply modified one. Why he made it a Jakoku design is anyone's guess, but it's not improbable that Jakoku was at least a bit different with foreign relations in the "BT to early EC era" than it is five hundred or so years later.