I have this theory that Zetsu is Madara's bunshin injected with Hashirama's DNA. And like any other bunshin, it has its summoner's chakra, aura, thoughts and memories. Maybe that's what the Kyuubi recognized.
My theory can be found here: http://mangahelpers.com/forum/showth...-a-single-body
Uh... how to put this... I was thinking about this, about what Kishimoto could ccome up with as an axplanation for Kyuubi recognizing Tobi/Obito.
Do you think that Kishi could say: "Well, Kyuubi was in Kushina and being sealed inside someone can see what the jinchuuriki can see, as shown with Minato and Kyuubi in Naruto. So Kyuubi just remembered seeing Obito through Kushina's eyes when she was with Team Minato for X reason and thus remembered Obito when he, as Tobi' entered the Inner Soul Realm of Kushina totake control of and unseal the beast" ? It would sound crappy and free, easy, cheap. But just in case I mention it. Because Kyuubi recognizing Tobi is a serious problem to what I consider to be non-sensical, absurd series of plotholes in Kishimot sensei. And since he seems to be trying to find excuses to fix them lately, I just anticipated one.
Counter argument to my "Kishi-sensei might do this satement": Kyuubi didn't recognized Sasuke when he entered Naruto's spirit world, he just noticed, from his eyes, that he was an Uchiha.
Reply to the counter argument: "Yeah, but Kyuubi did recognize Minato both during the attack 16 years ago when Minato returned to the village
, and when he reappeared in Naruto: http://www.mangahere.com/manga/naruto/v47/c439/15.html , so he could have recognized Obito.
My real statement: This is all crap, Kishi doesn't care about consistency enough. Kyuubi shouldn't recognize Obito in Tobi, doesn't make sense. How does his memory works? Recognizing the obvious one to whom Kushina was married and who sealed him into Naruto...
BUT Doesn't recognize someone Naruto spent years with and always dreams about and whom he fought against when overwhelming Naruto's body in The Valley of the End [Sasuke, that is]?
Yet being able to recognize Obito post Hashirama-cell jellyfishication hidden behind a mask and under a coat?
But he still remembers millenia old Rikudou Sennin?
I'm not Bill Gates, I can't buy it.
N.B.: This is an anticipation of a possible scenario that Kishimoto could come up with to explain troubles with the storyline of events and my possible come backs ti it.
Peace, Your comments would be appreciated.
One of the most plausible explanations is that kurama recognised obito because of he has seen him before in the past thanks of him living inside kushina and of course obito and kushina knew eachother before the accident at kanabi bridge since she was his sensei wife and kurama once seeing tobi sharingan recognised obito's familiar chakra.we knoiw that a bijuu can see their host entire life like in a movie since they live inside them.do not forget the kiss between naru and sasu and kurama remembered that detail to naruto some chapters ago.