Something I noticed in chapter 908 at the Five Elders words. “The candle that should have been snuffed from history has once again…”
It looks like they are probably talking about VOID CENTURY events, but that was about 900 years ago. By looking at IM position at the World Government throne, he doesn’t look like successor of some kind of king or something. While Celestial Dragons have the title GOD, the guy at the top of them must probably fit that nickname perfectly by being Immortal.
The main source to archive that so far it’s totally possible by Ope Ope fruit.
Mabye this explain Doflamingo’s special relation to World Goverment.
Note Doffy’s words to Moriah about the order that come from “UP”
Since Celestial Dragons are known about their luxury lifestyle and acting as they please, no political actions is seen by them so far. So orders from “UP” means IM>GOROSEI>Doffy
And the secret National Treasure of the HOLY LAND probably it’s not gold. Probably the National treasure is IM sama himself.
This would also explain Doffy’s plans about the Ope Ope No Mi (being the ultimante fruit, because it can give eternal youth to someone). Everyone believes that no one could sit at the throne since it is a symbol of peace and equality among countries. IM sama is actually the one who sits at it. Maybe this is the secret that Doffy blackmailed World Government.
So IM sama is probably immortal by the Ope Ope fruit or some other power not been mentioned yet.
*Theory by Hakani