Enzo Calzaghe should be on the list. His son had one of the most unbeatable styles boxing has ever seen. Also trained not very talented fighters Maccarenelli and Rees to world titles.
No Garcia in this?? I think at the moment he is the best. He has Donaire, Rios and Mikey right now. Those guys seem unstoppable at the moment and he built them up to be what they are. IT wasnt really until they got to him that they became as complete.
I like Garcia as much as the next guy but Nonito only had him for 2 fights and he is co trained by jonathan penalosa.
Not saying he is the best ... But when you train six world champions in different weight divisions ... Including Jeff Fenech and Kostya Tszyu ... You deserve a mention Johnny Lewis : http://en.m.wikipedia.org/wiki/Johnny_Lewis_(boxing_trainer)
Steward probably, though Roach and Nacho are right there. Nazim deserves a mention, he's good at taking a good fighter and making sure they are technically as disciplined as they can be and use their talents & advantages as best as possible.
I like Steward because he is great at helping fighters psychology which is a big deal in boxing. Steward has worked with a lot of fighters that need confidence and he has done well for them. Thats the sign of a great trainer. I'm not saying hes better than Roach though because they are like 1a and 1b. And theres nothing we can go off of with them. Roach has a natural legend in Pacquiao though so its hard to gauge how much of it is Roach vs Pacquiao's greatness. Steward doesn't really have any natural talents (maybe hearns was his 1 natural great) but he has worked very well in stretching their capabilities.
You forgot Naazim Richardson. Anyway, Freddie Roach has so many wins where you can really see his strategic contribution. Pacquiao-Morales 2, Hopkins-Calzaghe, DeLaHoya-Mayweather, Hopkins-Wright. Sure two of those are losses, but SD losses where he was training an a past-prime fighter. When you listen to Roach in the corner between rounds, you can hear he is the one who decides the strategy. Sometimes the fighter doesn't do what he's told (Pacman-Morales 1: "Pressure him and back him up!"), but the advice is always great.