The defeat of the Primordial Beast of Greed was not a secret as a world message was released upon its defeat. It was not just the players that are informed but also their enemies. The secret organization had a lamp tied to the existence of the Primordial Beast of Greed. When the lamp's fire suddenly blew out, they immediately knew that the Primordial Beast of Greed has died. They did not care much though as all of them thought as the Primordial Beasts of Sin as expendable.
The secret organization, Kami, only thought of the Primordial Beasts of Sin as expendable because of their nature to revive just like them. Unlike them that starts from zero, the Primordial Beasts of Sin will reform back into their peak power or at least that should have been so. The secret organization did not know that the Primordial Beast of Greed will never revive again. Its place in the world has already been given away to someone else.
