According to the text, why wasn't the final summary of the Shri Sai Satcharitra written by its original author, Hemadpant?

According to Chapter 53, the original author, Hemadpant, was unable to write the promised summary because he suddenly passed away, which left the book incomplete and grieved everyone's hearts. The chapter explains that while it is a general rule for an author to complete their own book, there are exceptions. This situation is presented as an example of a higher power at play, as the text notes, 'Nothing happens by one's own will; Baba’s will is more powerful.' Following his death, the summary could not be found among his extensive records, necessitating another author to take up the task.