Most gurus have some basic ideas, concepts, and techniques they teach, and they simply repeat the same things again and again from different angles and in different scenarios. It would be useful to have it all in one table.
For each guru create a table. The rows are the ideas, concepts, and techniques, and the columns are different scenarios and applications. Each cell should have a synopsis of the application of the technique in that particular situation.
See who is preaching what, the similarities and differences.
Publish a master table that lists the motivational speakers, one per row, and the principals, concepts, techniques and methods they teach, one per column. Show who is teaching what, and see who have unique techniques, who are very similar, etc. each row and column is a link to more information on the subject.