How did Sai Baba arrive in Shirdi and how did he get his name, according to the introductory chapter?

The introduction, Chapter 0, explains that Maharaj (later known as Sai Baba) accompanied the wedding procession of Chandbhai's wife's nephew to Shirdi. The procession stopped in a garden near the Khandoba temple. When Maharaj entered the temple, a gentleman named Mhalasapati saw him and welcomed him with the words "Aavo Sai Baba," which means "Come, Sai Baba." As the text notes, Maharaj held that name until the end and even stated in a commission that people called him Sai Baba. This greeting from Mhalasapati is the origin of his famous name.