It looks like my idea was the actual one thats going to be happening.. 10 points to me

(recap with more info put in)
A:
Obito was crushed : Tobi was constantly slothing off damaged parts in battle. He stated at the kage summit that he is too weak due to damage he sustained in previous battles (he said with the 1st, but he is not madara so I assumed being crushed by the cave.
B:
Obito was a kid / he wasn't evil when he was truely obito: Whos to say, since Zetsu is "one with the earth", that he is not of senju dna? And he needed Obito's Uchiha to become the sage of the 6 paths. Maybe tobi is just the innocent Obito, but Zetsu took over his body / brainwashed him into a type of "The leaf got you killed, let me fuse with your body and heal you and you can take revenge on them" Type of deal
As for him being a kid, He could be in a situation like Jugo where he was once a kid, but when zetsu fused with him, he became an adult looking form (Like when jugo was a kid, but killed / absorbed the soilder he killed and became an adult again. This is even further supported when Tobi was unmasked to show Obito... Half of him is old, aka the legit Obito, and the other half is young, aka the zetsu half. He has already shown what his spore clones can do by perfectly imitating someones chakra and appearance even after death, whos to say he didn't seed off part of himself to make obito complete so he wouldn't die from being crushed?
post 2:
Similar to Jugo, Zetsu may of offered Obito further life other than just dying under a rock by fusing his white self with obito.
I am assuming Zetsu is senju and wanted an uchiha mixed into him.
Similar to when jugo absorbed a guard and went from small to big again, that is what could of happened with Obito... along with White Zetsu's evil intentions taking over Obito's psyche.
Along with that, until Tobi fought Konan, he only showed one sharingan.. When he fought her, he had 2, which could be attributed to him killing the clan and having 50+ sharingan on-hand
Not to mention if Madara really created origional zetsu (which I believe is completely incorrect information, I am talking about the origional Zetsu not more clone white zetsues) That would attribute why Tobi was so angry when he learned nagato brought the Hidden leaf back to life instead of madara, because he wanted to bring his creator back to the living world.
He would need to pick an uchiha that was weak enough to fully control. We see that uchiha who are strong, such as Sasuke, are not as easy to control (even though he was sick, using orochimaru's little body xfer shit as an example), whereas Zetsu could of had the better idea and take control of him while he is weak..
Its really not that hard to believe that Obito gained skill enough to fight minato if it wasn't technically him in control, it was Zetsu using Obito.. (Zetsu's experience, Obito's powers)
Not that hard to believe that a year+ after obito "died" of non-stop training that he possibly opened a 3-tomb sharingan, upgraded to mangenkyo, and learned his true skill by killing the uchiha clan and reading the tablets.
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This post was edited by ZipperInYourMouth on Sep 4 2012 08:46pm