What specific nightmare was the gentleman having, and why was worshipping a picture of Baba a superior solution to just using the Udi he was given?

The provided text from Chapter 35 does not specify the content of the gentleman's bad dreams; it only states that after keeping a packet of Udi under his pillow, "the place of bad dreams was erased." Furthermore, the source does not frame the picture of Baba as a "superior solution" to the Udi. Rather, it describes a progression in the man's devotional practice. After finding relief with the Udi, he "later he brought Baba's picture," which he worshipped with respect. The text indicates that he "continued this disciplined practice," implying that the Udi, the picture, and his constant remembrance of Sai all worked together to resolve his troubles.