1. The reason I believe Madara will not disppear is because Muu summoned him.
Yes Kabuto summoned him before to scare Tobi but it was Muu who summoned him at the battlefield, so Muu is the last person to summon Madara.
Muu will disappear but Madara will be able to do what he likes now.
I do not know if the Edo Tensei technique gives the Edo summons limitless chakra.
Or if Madara will become weaker due to his summoner aka Muu being unsummoned due to Kabuto releasing the Edo Tensei Jutsu.
However if Madara were to be unsummoned also because it may still count as Kabuto summoned Muu so it may work that way, then if that the case I believe Madara will use the Rinnegan Rebirth Jutsu to bring himself back to life.
I believe Madara can do this now and not before is because his in Edo Tensei Mode, Madara is dead but Madara has the ability to perform techniques, Where if you die, you're dead, you don't have the ability to perform a technique because your soul has left your body and you can not perform it if you are dying because you are still alive.
But where Madara is in Edo Tensei Mode, Madara can perform Jutsu's, Like the Rinnegan Rebirth Jutsu.
Nagato could of done the same if Nagato had control of himself because he too has that ability but of course Kishi wasn't going to let that happen.
Either way Madara is NOT disappearing in my strongest opinion because of the two reasons I've explain which is..
Muu summoned him
or
Madara uses the Rebirth Jutsu on himself
I said Nagato could perform the Rinnegan Rebirth Jutsu because Nagato too was in Edo Tensei mode but was unable to perform the Rebirth Jutsu because the whole time Kabuto had control of Nagato plus Kishi wouldn't bring him back to life.
The reason why Nagato was unable to perform it on himself when Nagato was alive during the Pein Arc is because Nagato was still alive, so he couldn't bring himself alive even though he was dying due to the chakra exhaustion, he couldn't perform it when he was dead, his soul was no longer in his body.
The reason why I said Madara can do it is because his been released from the Edo Tensei Jutsu and yes Madara dead but his soul is in a body, so Madara can perform the Rinnegan Rebirth Jutsu on the dead body because Madara is able to perform the Rinnegan Rebirth Jutsu because his in Edo Tensei Mode.
For example to explain it better, I have a GUN that can bring someone back to life by shooting them once with it.
Nagato did this with the leaf village right? he brought them back to life by shooting them all. (get what I'm trying to say?)
Nagato couldn't shoot himself with the gun because Nagato is still alive but once Nagato dies, Nagato soul is gone so Nagato's body is lifeless and can not pull the trigger due to that.
Madara has been brought back With Edo Tensei Jutsu, Now Madara is released from the Edo Tensei Jutsu.
He has the Rinnegan aka the Gun I'm referring to, So before Madara disappears Madara can shoot himself with the gun because Madara has control over his body because Madara is in edo mode, a walking zombie...
Does that make any sense?[/COLOR][/B]