Silence, count Dong Li was silent! He couldn't help but remain silent, because what Jian Wuya said was the truth. In fact, he even thought that the fact that Jian Wuya was able to say these words to him meant that he truly treated him as one of his own.
If Jian Wuya didn't tell them about this and told them to fight with Zhao Hai, then the four sects would be done for. Even if they sent their core disciples to hide in the other worlds to inherit the legacy, it would be hard to say whether the legacy would be passed on.