Board Thread:General Discussion/@comment-9307023-20200720040859/@comment-29325824-20200815144614

KingofVIZ wrote: I did some digging, so in the We Do Knot Always Love You’ s commentary, Matsurada says that Narita and himself would go to Kubo for any Canon info for their books.

Thing is, that doesn't prove much. It just means they (to some degree) respect Kubo's wishes with how his work is handled and don't want to blatantly contradict stuff. It does not mean that Kubo himself considered anything canon in his own setting.

I'll compare it to One Piece. As revealed once, the makers of the movies and filler arcs usually go to Oda if they have idea's for a new Devil Fruit power. But that only means that Oda can tell them "Please no, I'd rather use that one in the manga itself in the future". And even then the filler arcs can sometimes contradict the manga anyway.

I'd love for the novels to be considered canon myself, but until we have a definitive, official word I can see why the wiki prefers to see them as EU.