At the Danze vs. Sasuke fight. I thought to myself it might be possible that 4 people knew of eachother's existence, sometimes aided each other, or stole from eachother.
The four players were: Tobi(I thought he was was what Zetsu is: Madara's will), Oro, Madara, and Danzo. Because Danzo had help from surgeons, probably the better kind. So probably Oro, and Tobi. That Tobi helped Danzo to work against the tailed beasts, even help capture them, that this Tobi-guy would betray Madara from resurrection. Oro would be watching from the sidelines and wait for his moment...
I wouldn't be surprised if the indeed know eachother, from edo-tensei or a Live Madara... I mean.. how did Kabuto/Oro get the Dna for the Tensei?? But I don't think they COULD work together. Plot together, yes...
