I have a lot of faith in Freddie Roach also but I'm not sure that this particular plan would work. It's how he has won his recent fights but his recent opponents have all come at him and tried to exchange punches. This will not be the case against Mayweather. One of my criticisms of Pacquiao is that he doesnt seem to have a back-up plan, he just relies on his superior speed and stamina. Against Floyd's defensive style I think he might need a plan B. I hope Freddie Roach is working on it.
Im a big fan of Freddie Roach, and I think he is smart enough to train Pacquiao into a position to simply outwork Mayweather.