I just had a thought about whose body Madara Uchiha is using...read it dudes!
okay, here it is:
Many of you have been speculating that Madara is Obito...
this cannot be the case obviously, but, from everything we've seen with Nagato and Rinne-Tensei, it is not completely out of the question that Akatsuki may have acquired Kinjutsus to AT LEAST reconstruct a body.
Take a look at Kakashi's Mangekyou Sharingan technique: Kamui
Space-Time Jutsu...teleports anything he sees, but that is one eye only...
The other eye () may have the other half of Kakashi's Mengekyou Sharingan technique...which may have something to do with Space-Time jutsu usage on the user's body...
this would explain it all...
Madara got too old with his own body, may have had an akatsuki member locate Obito's crushed body and reconstruct it (as we have seen with Kakuzu and Orochimaru)...Only an Uchiha would be able to use that Kamui-technique without extreme fatigue like Kakashi experiences every time he uses it.
think about it, plz dont flame, its a thought...not a theory, but feel free to use this thought of mine to create a well-based theory.