From Luo Mo's account, Mo Luo had arrived at the Dao Source Sacred Site long ago, when you had only recently left. From this, your earlier suspicion—that when the True Demon Clone attacked Ye Chen, his true body had been in Xuwu Yueheng Heaven—did not hold up. According to Luo Mo, he and Mo Luo had been at odds, and after their first meeting, they had fought again outside the Dao Source Sacred Site. Mo Luo had been extremely cunning. Before Zeli could rush over to support Luo Mo, she had already fled, not only escaping with her life but without suffering even a wound...
At a more distant time, when Mo Luo had only been at the Earth Flower Imperial Realm, she had repeatedly escaped alive from the hands of the already Tianhua Imperial Realm Taiqing Immortal Emperor. You had never truly met or fought Taiqing Immortal Emperor, but comparing the records of him throughout the All Heavens with those of other Immortal Emperors, the difference was still obvious. He was no ordinary man; among those of the same realm, he was at least among the stronger ranks.
To survive at the hands of the higher-realm Taiqing Immortal Emperor, and more than once at that, showed that Mo Luo's Myriad Manifestation Formless Freedom Ultimate Intent Art had genuine merits when it came to preserving one's life... In more recent times, when Mo Luo went to obstruct Yuanshi Tianzun for the second time, there had been no trickery involved. She had been set up in advance and had already entered the formation.
You had studied this formation in depth. It was the Dao Sect's famed Eight-ring Creation Dao Formation, the "Tree Realm Thirty-Six Heavens Absolute Formation"! This formation did not specialize in slaughter. It was particularly adept at trapping enemies.