So I was rereading recent chapters and realized something. Madara gave his Rinnegan to Nagato, and now he's plugged up to life support via Gedo Mazou. Isn't the Gedo Statue a strictly Rinnegan ability? I assume he could have just left the statue there before he gave his eyes to Nagato since he wouldn't be able to summon it for quite some time but that just seems weird. Is there anything I'm missing? Maybe when Nagato summoned the Gedo for the first time thats how Madara finally died haha