It seems that the Zoan fruits are the most powerful fruits in One Piece. First, Kaidou possesses a mythical dragon that represents strength in Oda's Japanese culture. Luffy is the God of the Sun, and now Imu transforms into a creature capable of absorbing Sabo's fire. The Five Elders are all monsters, and out of all living beings in the world, on land, sea, and air, Kaidou is the STRONGEST LIVING CREATURE. URGHHHHHHHHHHHHHHHHHHHH.