I am sorry Dale I think you attribute too much to the Scottish Dirk. As far as I am aware and I must confess no in depth knowledge here, that the oaths that any Scot may have given, other than perhaps, "I hope that I can kill them before they kill me" type thing and general ones that were far from complementary to ones enemy of the time. I only have a vague knowledge of Japanese customs and their weapons , but I really don't believe the Scots delved that deeply into oath taking and their weapons and this so say Scots oath taking are not comparable to Japanese custom at all.