Has any trainer had a 3 belt unified champion and an undisputed champion at the same time? If not then it has to be Derrick James. Idk how to feel about Bomac as far as the many trainers on his team but he has to be considered also being that he guided Buds career on top getting Jamel Herring to a world title with 3 defense is an impressive feat. Obviously Eddie Reynoso with Canelo, Valdez and Julio Cesar Martinez. Anatoly Lomachenko with Loma and Usyk. So for me thats: James Bomac Reynoso Lomachenko The field.