Pacquiao starting fight weight: 98lbs (to be fair he was only 16 but by 18 he was fighting at 112lbs) and gradually moved up. Pacquiao in 2008 fought at 129lbs and 8 months later fought Oscar at 142lbs (13lbs jump). Pacquiao was 30 years old. Kell Brooks starting fight weight: 147lbs at 18 years old (has fought at 154lbs). Kell Brook is jumping up from 147 to 160 to fight GGG for the first time (13lbs jump). Kell Brook is 30 years old. Pacquiao jumped up in weight with pure muscle. He didn't look fat. Didn't seem to lose much speed and stamina. His power did seem to increase. I know how he did it but I don't want to throw any allegations out there and piss any of the pacquiao fans off. He's still a great fighter. The point I'm trying to make is why cant brook do the same?