what i see as pac's strategy
1) Don't be afraid to flurry- Mayweather's shoulder roll is a great defensive position, but it is solely that, a defensive position impossible of any counter attack. Granted Mayweather gets his counterpunches in but they are usually in response to one or two punches thrown at him. The strong defensive position that he gains hinders money from responding to pacquiao's three to five punch combinations. However pac must force may into this shell by throwing in bunches. A good example would be Mayweather's fight with De la Hoya; although not damaging, Oscar's combinations against Mayweather's shell scored him points, enough for a split decision loss. My point on when he should flurry is specified on point 3.
2) dwyer70905, a betting expert that i respect brought up the important fact that Mayweather is not a southpaw switched orthodox fighter the way cotto and dlh was. Therefore, he was not going to have his power hand be inhibited by a lead punch (something pac has capitalized on all left handed orthodox fighters in the past). By not needing to reload so to speak on his left, mayweather can pick off pac's charging attack with his own left without having to sacrifice important power. mayweather's lead left hook as a result will be less powerful, but quicker than dlh or cotto's (hatton hitting the turnbuckle is a clear example of the quick, accurate left mayweather is capable of). With all that being said pac then needs to worry less about slipping and more about blocking. keep the hands up! although not too profiled for keeping his hands on the defensive, pac needs flurry in smaller bursts than before and keep the hands up at all the other times. if pac is going to slip may's left hook the way he did hatton or cotto, he'll be more in a position (head in a downward position and open) to get hit by mayweather's real money punch (the right). Pac has to time when the right is coming in by blocking all subsequent punches and slip after the right is delivered. This is a tricky left, a left that is used on the defensive more so than an offensive weapon. May can very will win this fight if pac keeps his hands down (like he usually does to throw punches). if pac keeps his hands up while he is flurrying, mayweather's defensive left won't be as annoying as it was to castillo or hatton.
3) Be smart and patient by pulling off a sugar ray-hagler flurry. I said before that pac needs to flurry but it is important that he does this less often than before and at the right time. May will catch pac's nuances and habits before the third if pac floors it to 120mph. But Pac has a high iq as well, and with roach by his side, it is possible that they can formulate a game plan before the fight and adjust it during the fight as well. In order to get the information they need, pac cannot flurry like he did before, he has to exhibit more patience. But lets be realistic, pac is a fighter-puncher first not a boxer. He won't do this forever. for the first three to four rounds, pac needs to be patient and if he gets hit while waiting so be it, he has the power to be able to steal rounds in the last minute like he did against cotto by kd's (ala rounds 3 and 4) or points (hence sugar ray-hagler flurry). If this attempt to steal rounds works, roach should be able to find the information they need to attack more often in the latter rounds.
This fight is really intriguing in the sense that it is a new type of challenge for pac. This fight isn't about size as it was with Oscar or strength as it was with hatton or toughness as it was with cotto. In this fight, mayweather might not cut pac like morales did, or get into a war like marquez did. But Mayweather won't need to, he just has to win. With all things considered, Mayweather is the favorite to win because his boxing gifts+intelligence are on paper more than enough to stop a punching machine in pac. Pac needs to be a smarter man, because if not mayweather certainly will be and will certainly pull of a ud.