Most of the youtube FE'ers and forum-FE'ers only focus on a specific subject within FE that they excel at, and are terrible at everything else. For Jeran I would say that his strengths are the airliner analysis and discrepancies, and discrepancies with the North-South circumnavigation claims.
He also does a decent job when he is collecting and referring to the works or quotes of others, and regurgitating the arguments in a presentable manner.