after reading the manga i noties that uchia madara sad that this is nagato's doing ,we all no that he upgrade mk to rin and die.been summon by kaboto, give an idea the story did't tell that madara met nagato ,madara can use the move that can bring the dead. he find a solution ,to give birth to a boy having rin , so that the boy can bring him back. and i think is nagato. need comment