Can you recount the story of Kakasaheb Dixit's vision of Vitthal and how Baba confirmed it?

Certainly. The experience of Kakasaheb Dixit, as narrated in Chapter 4, is a powerful testament to Baba's omniscience. One morning, after his bath, Kakasaheb was in meditation and received a clear vision of Lord Vitthal. Later that day, when he went for Sai Baba's darshan, Baba surprised him by asking, "Vitthal Patil had come, right? Did you meet him?" and humorously advised him to "Nail him down and make him steady" because he is a "big runaway." The ultimate proof came that afternoon when a traveling merchant arrived selling pictures of Vitthal of Pandharpur. Kakasaheb was amazed to find that one of the pictures was an exact match to the form he had seen in his vision, validating Baba's words and reinforcing the deep connection between Sai and Vitthal.