Top 5 trainers in the world?

Dark Lord belongs on the list.

 

Steward generally technically refines great fighters into even more dominant fighters with simple and effective technical adjustments that go a long way.

Roach guards against an opponent's offensive strengths with strategy and enhances his fighters' own with punching technique.

Nacho teaches proper technique & fundamentals and wide array of defensive and offensive skills. Makes complete fighters and sharpens already made ones.

Nazim and Garcia both try and make the best version of a fighter they have as they already are stylistically, and come up with great game-plans.

Mayweather Sr. and Roger, for their lack of resume, are good at teaching fundamentals and defensive boxing qualities.