Am I the only one who missed this in manga and realised about this in anime :OOOO
Back in these days after this 629 chapter I think it was pretty safe to say SO6P will make his appearance later on..
I think that scan says "someone with rinnegan from insides of Naruto is watching..." and I think its pretty safe to say Nagato is dead, Madara is right infront of him, so only logical explanation would be SO6P and since he was a God, its pretty possible that he is watching xD