C82 Divine awakening
Besides Lord Taishang, there was only one disciple known as Great Mage Xuan Du. Furthermore, Great Mage Xuan Du had always followed Lord Taishang to train, and did not have any karma, so he was not destined to be on the list.
The Primordial Heavenly Sovereign and the Sect Leader Tongtian both had many disciples, and the Sect Leader Tongtian was known as the Emperor of the Ten Thousand Immortals