My favorite saint isn't mentioned in this book. Does the Shri Sai Satcharita only consider certain types of saints or gurus valid?

The preface of the Shri Sai Satcharita establishes a very broad and inclusive view of spiritual guides. It emphasizes that the principle of needing a Sadguru for salvation is ancient and that the Sadguru can come in many forms. According to Chapter 0, a Sadguru may belong to any caste or religion, can be a man or a woman, a family member, or even a book. The text's main focus is on the necessity of a Guru's grace for salvation, rather than on a specific list of approved individuals. Therefore, while a specific name may not be present, the principles laid out in the preface do not invalidate other spiritual figures.