Who was Devidas and what was his encounter with the Fakir as told in Chapter 5?

According to the account in Chapter 5, Devidas was a wise individual who had come to Shirdi and settled there twelve years before Sai Baba returned with the wedding party. He was a teacher who taught figures like Appa Bhill and was taken as a Guru by Tatyaba. The chapter describes an incident where a Fakir challenged Devidas to a scriptural debate. Devidas, with his wisdom and detachment, defeated the Fakir, who then fled to Vaijapur in humiliation. This same Fakir, after many years, returned to Shirdi and bowed to Sainath, his delusion about his own status having been dispelled by his encounter with Sai's grace.