Board Thread:Naruto Discussions/@comment-28861328-20140618060932/@comment-7862945-20140623223238

FF-Suzaku, is the "official" translation VIZ? It's not always the most accurate either.......

and SuperSajuuk: Madara, and in turn Obito, were fooled by Black Zetsu into believing that they were creating the White Zetsu (though Kabuto did use Hashirama's cells to make them stronger). They were actually previous victims and Madara (and Obito) didn't know about that.