This is nothing but dividing the Human Race, cultivating a second Human King, and having him compete against Jiang Chen in the arena.
There is no expectation for this Human King to win; as long as he can hold his ground against Jiang Chen's counterattacks, the purposes of those Great Divine Transcendents will have been achieved.
By supporting a new Human King, causing a division within the Human Race, it's essentially weakening the Human Race's strength and plundering their fate among other objectives, thereby killing multiple birds with one stone.
This plan is quite obvious, and many Great Divine Transcendents can see right through it, even the Human Race experts are well aware of it. In fact, Jiang Chen and others are deliberately facilitating it.
Everyone is gambling, betting that they can win.
The Great Divine Transcendents of the Mystic Sect believe they can have the last laugh, seizing control of the Human Race and sharing in their fate.