Can you tell me about the orthodox man from Nashik who is introduced in Chapter 12?

Certainly. Chapter 12 introduces the story of a ritualistic and orthodox Agnihotri, who is a keeper of the sacred fire, from the holy city of Nashik. His surname was Mule. The chapter explains that he came to Shirdi due to the strength of his past merits, as the text suggests that no one can even stay in Shirdi for a moment without such merit. His visit is described as a "strange thing" and a "rare meeting with Sai." Interestingly, the chapter notes that his original intention for the visit was different from the outcome, which ultimately led him to gain the benefit of Shirdi and see his own Guru.