According to the preface, what distinguishes the Shri Sai Satcharita and the Thorale Guru Charitra from other contemporary Guru biographies?

The preface discussed in Chapter 0 sets the Shri Sai Satcharita and the Thorale Guru Charitra apart from other works primarily through their comprehensive detail and resulting fame. The text explicitly states, "Apart from these two Guru biographies, no third work written in such detail is found." While other biographies existed, such as a scholarly one by Shri Samarth Sadguru Tembhe Swami and another by Shri Samarth Sadguru Dattatreya Maharaj, they had not achieved similar fame or were not yet published. Even the excellent works by Shri Dasganu Maharaj were noted for being very short, reinforcing the unique, detailed nature of the Satcharita and Guru Charitra.