Returning to Void and becoming divine is one thing, while Integration is another, but don't be fooled by the seemingly small difference of one realm between Integration Mahayana. In reality, it's the difference between heaven and earth. Many cultivators at the Integration phase, such as Lord Chu Shan and Lord Lutu, have been trapped by the bottleneck of the Integration phase for tens of thousands of years, finding it difficult to condense the Immortal Spirit Mechanism and progress to the Mahayana Realm.
For such cultivators, receiving guidance in the discourse of Mahayana is an invaluable opportunity. It might allow them to leverage the experience to shake the bottleneck and break through the realm.