What are the weaknesses of the four ghosts in Xiangxi?

According to Douban's query, if the Four Ghosts in Xiangxi didn't teach monkeys thirty-six days of plough, even if they beat it, Hou Shen would have to work hard to deal with it. This gap can completely make 33,000 people run away, but the four ghosts in western Hunan also passed on the martial arts of resolving other people's internal forces to the Empress Shen, and the Empress Shen learned the 36-day plough plus the absorption power solution, so it was so easy to deal with it.