In the end, Xiang Shan didn't really possess two independent personalities.
Both "Personality Masks" operated based on the same biological brain, and could access the same storage resources. Whatever memories the "Eighth Martial God" had, "Native Xiangshan" had as well. The same was true in reverse.
All the data from that storage device had already been downloaded into this prosthetic body.
At most, the "Native Xiangshan" personality mask, as a piece of software, was not compatible with the newly installed personality role applications and the accessed nanoconductor artificial neural circuits, so some thoughts couldn't be directly formulated and required the assistance of virtual algorithms to complete.
It was like a top student and a poor student facing the first bonus question on a math test. The top student could give the answer without even a draft, while the poor student, scratching his head and pondering hard, could also solve it after some effort.