Based on the preface, why is the Guru biography by Shri Vasudevanand Saraswati Maharaj not categorized with those by Shri Saraswati Gangadhar and Shri Annasaheb Dabholkar?

The preface, as documented in Chapter 0, provides a specific reason for distinguishing the Guru biography written by Shri Samarth Sadguru Vasudevanand Saraswati Maharaj from the works of Shri Saraswati Gangadhar and Shri Annasaheb Dabholkar. Although his work is described as detailed and scholarly, it is set apart because it was 'written by the Maharaj himself.' This implies a fundamental difference in perspective and authorship, as the author is also the subject or a figure of similar spiritual stature. The other two biographies, as Chapter 0 frames it, were written by devotees or followers, placing them in a separate category from a work penned by a Sadguru.