XIETIAN
I only realized it as a reader that knew about Lilith's power, but if those intelligent college kids put some thought behind his words, he basically implied Lily has a strong soul power. He said he had confirmed that the method worked by sharing records with Lily. He also said that he previously accepted the theory that a difference in soul power could cause rejection, and only changed his mind at this failure. I wonder if any of them will put it together, or if it'll slip past them.
Without a large number of observations or proof, it is also a theory in the end. You'll also need to know how a soul has affinity towards another soul. When bai zemin shared his records with lilith nothing happened. Does that mean they have near 100%affinity? or there are other factors at play? Well teacher Xietian will enlighten us about it in future.