You don't have to worry about this problem. Although they all used the greedy giant Lu Wenlian to break the vice cannon, they were actually two people just like the same name. Here, Ba Zhai and Kong Xuan are also two sets of theories. As for why they use this name, it actually comes from the theory that feng shui is a natural image and is shaped underground.
The five elements of Bazhai Hungry Wolf Star are the same as those of Yang Gong and Luantou nine planets. Its five elements are wolf hunger for wood, Lu for soil, fire and so on. They all use the five elements of the Big Dipper directly.
Although Kong Xuan is also called "The Greedy Wolf Giant Gate", he actually uses Luo Shu and Five Elements as much as Luo Shu and gossip the day after tomorrow.
You just need to remember their inner meaning. Don't worry.