According to Chapter 48 of Sai Satcharitra, what are some practices or qualities that do not, by themselves, qualify a person as a Sadguru?

Chapter 48 is very clear in listing several qualities and practices that are insufficient for one to be considered a Sadguru. The chapter states that wise men do not call someone a Sadguru merely because they have studied the Vedas or have knowledge of the six Shastras. Similarly, being able to explain Vedanta, control one's breath through Pranayama, or please audiences with talks about Brahman are not defining signs. As Chapter 48 mentions, even giving out mantras from scriptures is not enough, as such knowledge can be "verbally hollow" without direct self-experience.