Ok so as of now we have had small foreshadowing panels the show that naruto could infact become the SO6P. What if the mystery person is the person saved Madara and is using Madara to see if Naruto really infact has what it take to be the new SO6P. What if the mystery person is the son that the sage that he "loved" more and he has been intrusted to find the person who is worthy enough to become the new SO6P and finish what the Original SO6P could not and that is to bring true peace and understanding to the ninja world. I have nothing to back up this theory, but i would love to hear what you guys think.