Nagato seemed completely out of the loop. Kabuto, Itachi, Orochimaru seem to know more about his heritage than he did. I can understand Tobi since he's been around for a long time. Did he know Tobi was not the real Madara? Did he know his rinnegan was transplanted into him by Tobi? Did he know about the Uzumaki clan? Nagato didn't seem to know anything about the massacre or the attack on konoha by Tobi. He showed no acknowledgement towards Naruto about the uzumaki. I hope Itachi brings Nagato back so he can learn the truth!