Did everyone present with Boss Dharamsee experience the same miracle with the grapes? What does this imply about Baba's interactions?

No, the miracle of the grapes was a personal experience intended solely for Boss Dharamsee. Chapter 35 makes this distinction clear. After Dharamsee was amazed to find his grapes were seedless, he asked another devotee, Babasaheb Tarkhad, who was also receiving grapes from Baba, about his experience. Tarkhad replied that his grapes did indeed have seeds. This revelation left Dharamsee 'extremely surprised.' This detail highlights a key aspect of Sai Baba's method: his interactions and leelas were often highly individualized. The miracle wasn't a public spectacle but a precise, tailored response to Dharamsee's specific inner state of doubt, dislike, and ego, demonstrating how Baba's grace meets each devotee exactly where they are.