Ye Futian knew that Jieyu had secretly cultivated a technique. She should have obtained the technique when she was training outside with Xia Qingyuan the other time. It was because she cultivated the technique that she caught the attention of the empress during the battle at the Holy Palace.
It might also be the reason that she could still exist in this world. Otherwise, the last vestiges of her soul would have long scattered into the universe.
If he thought about it that way, what the influential figures told him was probably true. That technique was the only reason Jieyu managed to stay alive, but her life was no longer her own.
Also, there was one more incident that could prove the theory. In Brahma's Pure Sky, other than the Empress, there was also the Jiutian Goddess and the Great Virgin Qin He. However, why would Jieyu become the personal disciple of the empress and the core figure in Brahma's Pure Sky? Why would the Empress pay so much attention to her?