The person who was eyeing the Ao Race was not Mo Xiu, but Saintess Qing Ru.
After separating from Mo Xiu, the Saintess Qing Ru has been inquiring about the Origin of the Five Elements, trying to find even part of the Origin of the Five Elements, so that she had the face to go back and explain to the people of the Human Race.
Kun Guang was too strong, that part of the Origin of the Five Elements was not something she had the opportunity to get. She had this self-knowledge. So even if Kun Guang never hid his own whereabouts, she had no idea to attack the Origin of the Five Elements of Kun Guang.
As for the Dark Race expert, because the Human Race people led by Mo Lanyuan were entangled and forced to fight in an artificially divided space, Saintess Qing Ru did not have the opportunity to contact.
The rest was the Origin of the Five Elements of Zhou Qiong and the Origin of the Five Elements of Ao Race's Ao Li.