How does Chapter 50 of the Shri Sai Satcharitra differentiate a Sadguru from other types of fathers?

Chapter 50 draws a clear and profound distinction between worldly fathers and the Sadguru, who is presented as the ultimate spiritual progenitor. The text first acknowledges other paternal figures: the biological father, the one who performs the thread ceremony, the provider, and the protector. However, it elevates the Sadguru as an 'extraordinary progenitor.' As explained in Chapter 50, unlike a worldly father who gives physical birth, the Sadguru provides a spiritual birth to the disciple 'without spending a drop of seed' and without the physical 'lower birth canal.' This rebirth is achieved by granting full initiation (Anugraha), which makes the Sadguru the one true father capable of ending the cycle of birth and death for the disciple.