We can conclude that Sigu Jian had thirteen disciples, twelve of whom were ninth-level experts. However, the information on how many Level Nine experts there were was not explicitly mentioned. Thus, it was impossible to accurately answer how many ninth-level aces Sigu Jian had.
Sigu Jian had a total of 13 disciples. Twelve of them were ninth-level experts. Thus, Sigu Jian had 12 ninth-level aces.
Sigu Jian had thirteen disciples, including Wang Xi (Thirteenth Wang), Yun Zhilan, and Li Bohua.