Frankly, Xiang Shan also felt that the team was becoming somewhat problematic.
Solo Kill King was a Martial Artist with prominent Inner Strength skills. However, due to the presence of Hartman, Earth Heroes were considerably suppressed in their development of Inner Strength. They would progress slowly due to a lack of interaction with the internet. Solo Kill King's skills overlapped too much with Xiang Shan's, yet his level was far below Xiang Shan's.
Because of the nature of modern automated systems, in an Inner Strength Battle, a person with high-level access could function as a thousand people.
And Cain was essentially a Burrow Dragon with the nature of a local snake, rendering his combat ability even worse.
From this perspective, Xiang Shan would rather have Yuan Wenren as his assistant.
If it were one-on-one, Yuan Wenren would be much weaker than Solo Kill King under most circumstances.