Perhaps they thought about it but gave up because of their belief that no one would be able to forge a blade.Great chapter, but there was something I missed: who invented/devised the "eternal contracts" part of it all?
Was it in the original plans for Kunishige? Did the Masumi do something about it? Or was it Hasumi's doing?
Apparently it was in the document, but I don't know if it was Kunishige's plan. Was it Hasumi's or Urita's?