What are the different types of fathers or gurus mentioned in Chapter 50, and which is considered supreme?

Chapter 50 outlines several types of father figures but ultimately elevates the Sadguru to the highest position. The chapter lists four kinds of fathers: the progenitor who gives life, the one who performs the thread ceremony (a type of Guru), the protector who provides food, and the one who saves from fear. While acknowledging these roles, the text emphatically states that "without a merciful Sadguru, there is no other true father." As explained in Chapter 50, the Sadguru is considered supreme because he is an "extraordinary progenitor" who grants a spiritual birth through initiation, which ultimately leads to the cessation of the cycle of birth and death, a power none of the other figures possess.