Mu You was completely out of options this time.
Looking at the situation, the former king is like a god in most of the wild tribesmen's hearts, and the words left by the king are heavenly edicts that must be followed. To convince them, it seems the only way is to resurrect the former king or have the Divine Devouring Beast openly invade Jie Lin, so they might wake up.
No wonder the wild tribes are so difficult to communicate with; the Clan Leader himself is an old stubborn who doesn't understand flexibility. What comes from the top naturally reflects below, so the people under him wouldn't be any better.
Afterwards, Mu You was 'ushered out' and left the council hall, but he didn't leave the seventh level directly because Scythia, who brought him here, was asked by the Clan Leader to stay for old times' sake.
Mu You thus gained some time to linger on the seventh level.