Since there's no systematized, look-it-up-in-your-economics-textbook definition of thought leadership, people generally lapse into metaphor when they try to describe the concept. The language usually gets very Joseph Campbell-ish. Thought leaders might be visionaries, Delphic conduits into some shared future. Or, they might be heroic trailblazers, clearing a path into places that no one knew existed, or they were afraid to venture.
Our recent research into thought leadership points to a different metaphor. Thought leaders are not seers, like Cassandra or the Sibyl. They're closer to trailblazers or founders, like Romulus or (less mythologically) Alexander the Great. But even that's not exactly right, since thought leadership depends critically on communication. Alexander got a lot of good press; Cyrus the Great, the founder of the Achaemenid Persian Empire, got much less (at least in the West). As a result, people are still sifting through Alexander's career for nuggets about successful leadership. Cyrus the Great? Not so much.
Thought leaders are, to a big extent, more like Homer than the people whom Homer chronicled. They're good story-tellers, which demands far more than relating a collection of incidents.
Just ask anyone reading a success story on a tech vendor's web site.