Jiang Chen never took the threats of the Mystic Sect's Great Divine Transcendents seriously, simply because he had already thought of a way to break the game.
Jiejiao Sect disciples were the key to his strategy.
Since he couldn't keep all the benefits to himself, and had to share a portion, why couldn't he allocate these inevitable concessions to the forces that had good relations with him?
Trapped in the Investiture of the Gods, with no hope of transcendence, the Jiejiao Sect disciples would certainly not refuse if Jiang Chen took the opportunity of the revival of Spiritual Energy in the Nine States to step forward and ask them to reincarnate as True Dragons into the Human Race, allowing them to practice once more.
Once entered into the Investiture of the Gods, they would be barred from the Immortal Dao for life, driven by others as if they were slaves despite being called gods. Surely the Jiejiao Sect disciples did not wish for such a fate.