World Strongest Man in the picture, depicted from the world strongest creature.
Not the world strongest subset of subsets like vista-dodging gorilla-fearing sweat-hawk.
Uncapable of reading subtext.
Talking about ceiling, he pictures the ceiling. The ceiling are the World Strongest Man and its rival.
No, because Kaido doesn't know that Imu exists, silly!
But it confirms that Kaido doesn't consider any of the people I listed, like Assmirals or Warlords as ceiling of strength.