You could be right and joyboy really pulled a 1,000v20 on imu and still lost lol (joyboy downscale)
but for now I think that part of the mural was obviously for future reference of the third world.
For one it states “The sea god raged!” Which was Poseidon after joyboys death the world flooded and people had to get on a ship. Which is what’s detailed for the second world here.
the king on zunesha seems to be a young nerona Imu who has now become king of the world