Obviously, Lu Xinyang's words reminded Yang Ming of the purpose of these people. This way, it could be explained why they were robbing the bank as if they were performing a task. Moreover, they threw the money from the robbery on the roadside.
In fact, the employer's purpose in doing this was very simple. It was to confuse the crowd to think that this group was a gang that continued to commit crimes, rather than targeting specifically for the jewelry.
However, why did the employer want to create such an illusion? He spent money to hire people, and even if they specifically targeted the jewelry, there was nothing wrong with it. This involved a problem that Sun Jie once spoke of, which was the issue of internal people committing the crime.
That was to say, only when the employer was an insider would he do something extra to stay clear from it. However, the more he did so, the more it revealed his identity.