The early phase of the Water Margin story told of the marginalized and convicted officials who were fixed up by corrupt powers of the day. And they had no where to go, could not emigrate, except to escape to Liang Shan.
The first chief of the Liang Shan rebels was Wang Lun, a small minded selfish man of average intellect. As more and more able and more talented men flocked to Liang Shan, he felt threatened and tried to send them off. He wanted to remain the top dog for as long as he could.
To his disappointment, as more people and officials were driven away by corrupt court officials, he could not keep them away no matter how he tried. Eventually his reluctance and selfish desire to protect his own position led to his own demise. He was killed by Lin Chong, a powerful ex govt military officer.
Whether in govt or in the rebel camp, once the top dog has outlived his usefulness, and when more able and talented people appeared, they must make way or be removed one way or another. Resistance is futile. They will be bungled out to the wilderness.