All "Fate" references & hints, indicate that the Story of OP is Manipulated by Someone,
It's also an Idea that Oda used before in his Pre-OP One-Shots,
It's also present in a Movie that Oda heavily Inspired from (Adventures of Baron Munchausen),
And seeing how Current Emperors all seem to have Luffy's Ability to make People attracted to them, i think They represent the only ones who Threaten this Narrator,