I was thinking about who Monkey D. Dragon could potentially face in the future, and it seems his most likely opponent as leader of the Revolution would be Kong, leader of the World Government(as World Government Commander-in-Chief Kong’s authority is now second only to the Gorosei).
Both of these characters have yet to reveal their power and both are conveniently named after powerful mythical creatures. It’s possible that these are both alias’ and both are named after their ridiculously powerful Devil Fruits, those being the Dragon and King Kong Zoan Fruits.
This is further supported by the fact that all previous Admirals (as we know Kong was the Fleet Admiral of the Marines at the time of the Battle in Edd War twenty-seven years ago and at the time of Gol D. Roger’s execution twenty-four years ago) have had a nickname based on their Devil Fruit ability, e.g. Akainu meaning “Red Dog”.
*Theory by a_cups_are_superior