Board Thread:Naruto Discussions/@comment-32617252-20170909181532/@comment-734582-20170912082130

Lorenzo.r.2nd wrote: neither has orochi. wanna discuss if he can do it too? cuz, he obviously can. We've had this discussion before. Danzo had an entire Hashirama arm (but also the face, which allowed him to use it), Obito had half his body covered in it (and even then couldn't use it unless aided by spiral zetsu), Madara had a hashiboob (again, the face, and he could use it).

By the established pattern, a Zetsu alone isn't enough for Orochimaru to use it, and a forearm isn't enough for Naruto.