How did Sai Baba's approach to healing people evolve during his time in Shirdi?

According to the introduction of the text, Maharaj's healing methods underwent a significant transformation. Initially, he would give out medicines to people free of charge and would even personally care for patients who were not being looked after properly. However, he later stopped this practice. As Chapter 0 explains, he transitioned to giving only Udi, or holy ash, which people found beneficial. Maharaj himself mentioned to the author, whom he called Kaka, that he used to give medicine but later stopped, indicating a clear evolution in his approach to healing.