Greatest Manager/Trainer of all time?

Yes indeed, you are correct. Yank Durham was Frazier's first manager and trainer and he deserves credit for finding and building his career. Although Yank passed away during Frazier's career, Futch was apparently calling more of the shots in the corner.

 

Freddie Roach and Nacho Beristain are the 2 best trainers in the game today. Its one of the reasons I was looking forward to the Pacquaio-Marquez rematch so much.
Out of all time, it would probably have to be Eddie Futch or Ray Arcel. Each of these guys have trained a ridiculous amount of champions and their strategies and fight plans were all top notch, especially Futch for example with him being the common factor in Ali's losses.

 

Angelo Dundee