Mo Honghai even suspected that the Mo Family disciples who died in the Secret Realm were related to Mo Wuji, but he had no evidence.
Mo Wuji has now mastered the Painting Sword, deeply gaining the support of the elders. Even the ancestor, upon hearing this, paid him special attention. So, even as the Family Head, he cannot move against Mo Wuji without solid proof.
Currently, he only has two ways to eliminate Mo Wuji. First, break through to the Body Integration Realm to have the capital to talk with the ancestor. Second, find evidence linking the deaths in the Secret Realm to Mo Wuji.
However, Mo Wuji has been enduring for so long, with meticulous thoughts and tenacious will, always leaving no traces. Catching him would not be easy. Therefore, breaking through and gaining absolute strength would make dealing with Mo Wuji much simpler.
