Conversation so far:
What are hagiographies?
Namdev and Jnanesvar used the Marathi language to convey their beliefs rather than using the traditional Sanskrit language.
Was their reliability in question?
"He taught that all can be saved equally, without regard to caste, through devotion (bhakti) to Vithoba" and that he greatly influenced groups of people who were forbidden.
Did he have a large following?
he greatly influenced groups of people who were forbidden by the Brahmin elite from studying the Vedas, such as women and members of the Shudra and untouchable communities.

Question: Was he able to make a positive change?
Self-contained rewrite: Was Namdev able to make a positive change?