Way back in the 90s Ringside did a promo tape on "Working the Mitts", and Roger Mayweather was featured in this tape. What he was doing, and this was not with PBF, was remarkable. He was teaching, through his mitt work, things like "centerline" of the body in punching , balance, and defense, especially the "pull-counter" which his nephew uses so effectively. You can use the mitts, just like you can use the heavy bag, the speed bag, and the jump rope, to make a fighter look like something he is not. You can also use them to make a fighter into something he might not have been otherwise.
I don't know if this is relevant but...Let me get a double end bag working with my jab and I'll hit it all day with my eyes closed. Better than I can with them wide open, since the vision in my right eye got so bad.
Last, Freddie Roach is the best trainer today only by the standard of money earned and only because there are so few trainers worth speaking of these days. Name one single fighter- no sorry, one beyond Pacquiao- that he has improved. Name ONE that he has developed. I watched him work in Phoenix, and I've spent many, many hours in his gym in Hollywood, and I don't get it. Take some time and total up his flops and failures...he doesn't do much for a fighter except give them a "name" in theior corner and take a bigger piece of the purse. Which puts him in the class of Steward and Clancy and Dundee, et. al.