I'm not jealous over a title, I'm just trying to point out that someone who is "said to be" something doesnt mean they ARE. Also, definitions can differ depending on context. Even in the seibutsu that you posted, they make a distinction between living thing and creature. Have you ever asked yourself why Worlds Strongest Man/Worlds Strongest Creature are separate titles? It's almost like... theres a distinction. And given the coexistence of WB having the WSM title, and Kaido having the WSC title, this seems to indicate that within one piece, creature does not mean literally every living organism.