I'm just gonna say it. Madara isn't dead. Eventho the manga won't cover his comeback since it's ending, he isn't dead. It never showed him being dead. It is your assumption that he's dead.One's reality might be an other's ilusion. We all live inside our own fantasies. Thinking Madara is dead is merely an arbitary acemption that you made in exactly the same way you once asumed that Tobi was Madara