The REAL White Zetsu Discussion
As of the latest Chapter 553, Sasuke was shown "killing" White Zetsu, presumably the real one. But what interests me the most is the fact on how poor his "death" was.
For such a mysterious character, i don't think Zetsu would just go away like that. Yes, really. We know nothing about him. Besides, if White Zetsu died then Madara couldn't regenerate his body parts anymore. And Zetsu can recover by himself, so i don't think he's dead.
Random Zetsu "killing" just makes me think that in fact HE will be the final villain.