Once Yang Jian sees through their disguise, he will pin the blame on Ji Changsheng — although Ji Changsheng is indeed not wronged.
In the struggle for Supreme Unity, there are details everywhere. Hidden veins run a thousand miles; some tactics may not be needed now, but one day in the future, they could prove to be crucial.
Li Huanyan could only say that, as the Devil Ancestor, Luo Hou did have his methods.
But to expect Yang Jian to trouble Ji Changsheng... Luo Hou would have to ensure Yang Chan is protected first.
Otherwise, even if all truths are laid before Yang Jian, as long as Ji Changsheng has a grip on Yang Chan, Yang Jian would obediently follow orders.
What cannot be overcome is a weakness.
Ji Changsheng could manipulate Yang Jian through the weakness that is Yang Chan, for a lifetime.
Great Emperor Changsheng is a dignified person, and thus is willing to stoop to collaborate with Yang Jian for now.