In "Water Margin", the process of Song Jiang taking over Liangshan is a gradual process, not an overnight one.
Song Jiang was not the leader of Liangshan Bo at first, and the reason why he was able to eventually become the leader of Liangshan was closely related to his personal charm, resourcefulness, and the changes in the internal situation of Liangshan.
Song Jiang was initially just an ordinary scholar, but later fled for murder, and in the process of escaping, he gradually established contact with the heroes of Liangshanbo.
At first, the actual leader of Liangshanbo was Chao Gai, but after Chao Gai was injured in the clash with the official army, the leadership of Liangshanbo gradually became vacant. It was in this context that Song Jiang's influence began to rise in Liangshanbo.
Song Jiang was able to stand out in Liangshanbo because of his strategic vision and ability to handle interpersonal relationships. By spreading wealth and making friends, he won the trust and support of many heroes.
At the same time, the political wisdom he showed in dealing with the relationship with the imperial court also made his position in Liangshanbo more and more important.
As for Wu Yong, he is one of the members of Liang Shanbo's think tank, and he is well versed in strategy and stratagem. In "Water Margin", Wu Yong initially had reservations about Song Jiang, and he even tried to prevent Song Jiang from going to Liangshan.
This may be because Wu Yong saw through Song Jiang's personal ambitions and strategies, and was worried that Song Jiang's addition would affect Liangshanbo's internal structure and future direction. Wu Yong may have believed that Song Jiang's accession could bring instability and affect Liangshanbo's long-term interests.
Over time, Song Jiang's gradually demonstrated leadership skills and contributions to Liang Shanbo eventually won him the recognition of Wu Yong and others. Especially after Chao Gai's death, Song Jiang finally became the leader of Liangshanbo by virtue of his ability and interpersonal relationships.