Anyway, all the novels in the One Piece magazine are intended to be canon. Not sure whether you think Oda doesn't give his input on them, because he does. If they weren't canon, they wouldn't even state anything new about the characters. They would be inconsequential like a filler arc which simply reuses character tropes. These are not, bone of them are.
And there isn't a Zoro novel so idk wtf you're talking about.