Board Thread:Episode Discussions/@comment-1181222-20170823100207/@comment-1512913-20170826125808

Enma isn't spirit weapon. Also someone crafted Samehada somehow, so it's within the possibility that magically imbued weapons can be made by ordinary individuals who know how. Edit: Kusanagi doesn't seem to be a specific sword, rather it's a type of a sword within Naruto verse, so Sasuke's swords aren't any less Kusanagi than Orochimaru's. If I were to guess, the origin of the Kusanagi swords is the Ryuchi Cave.