After the Heart Demon manifested, the situation flipped in an instant.
For Jiang Wang, the greatest advantage lay in Tongtian Palace itself.
Jiang Wang was the true source of this Flesh Body, the soul tied to life, and his Tongtian Palace inherently led by him.
Jiang Yan had no right to contend with Jiang Wang for Tongtian Palace; it was by first inducing the Heart Demon, then through this Heart Demon born of the same origin as Jiang Wang that invaded and took control of the True Spirit of the Dao vein, that he was able to stand on equal footing with Jiang Wang within Tongtian Palace.
Now that Jiang Wang had self-mutilated to nourish the Heart Demon, which in turn had developed intelligence, Jiang Yan's authority over Tongtian Palace was stripped away in an instant.