Helps with transfering weight through the punch.... but its not nearly as important as proper punching technique and other factors. Mosley is the bigger puncher also.
Its the same amount of weight distributed around a smaller frame. Common sense that they are bulky at the higher weights they fight in. Ever watch pazienza or duran fight? They looked bulky when they fought at the higher weights, just like pacquiao.
You should probably read this. Its not the be all and end all, but wrist size has a strong colerration with a fighters natural weight class. http://www.badlefthook.com/2011/3/1...manny-pacquiaos-body-has-tricked-analysts-and
This is so stupid. Wrist size doesn't matter. Neither does fist size. If anything the SMALLER your wrists and fists the more devastating the punch due to the concentration of force onto a smaller surface area. It is the same concept at work with a blade. Pac is a drug cheat. His fists, wrists, and facial structures are huge as a result of whatever cocktail he is using. Take the tests Manny!