According to Chapter 50, how does the role of a Sadguru as a 'father' differ from other paternal figures?

Chapter 50 of the Shri Sai Satcharitra distinguishes between several types of fathers before elevating the Sadguru as supreme. The text acknowledges the progenitor who gives life, the guru who performs the thread ceremony, the protector who provides food, and the one who saves from fear. However, it describes the Sadguru as an 'extraordinary progenitor.' Unlike a worldly father who gives physical birth through the womb, the Sadguru provides a spiritual birth. As Chapter 50 explains, the Sadguru accomplishes this 'without spending a drop of seed' and 'without the lower birth canal,' instead giving birth to a disciple by granting full initiation (Anugraha), which has the power to end the cycle of birth and death.