Originally Posted by
paulbee
Why can't Tobi be a Zetsu Clone of Madara, charged with Using the Rinnegan to Revive the Original. As we see, Zetsu clones have all the abilities of the original., and it would be a simple matter for Madara to imbue the clone with his mental energies.
I just have a huge problem with pulling Izuna's name out of literaly nowhere for this purpose, when there are other viable hints.
Tobi claims to be Madara...Why would Izuna do that?
Itachi Identifies him to be Madara
Minato identifies him as Madara
As a Zetsu Clone (which he is at least partially is, he could be Madara, and still want to Revive through Rinne Tensei, the original.
Finally, Remember how Tobis answered Kakashi's question to him about what are his goals? He said he wanted to be complete. The Zetsu Clone partial Madara wants to be made whole by reviving and reuniting (physically?) with the Original, using the Rinnegan.
I think this is the most direct answer so far, until Kishi throws in another curve.