Not really. Fighters can fight at any weight as long as they are comfortable with it. Some of them move up not because they can't make weight anymore, but because they have now put on more muscle for power, and go to try a different road on a different division.
GGG could go down to 154 if he wanted to. Pacquiao can go down to 140. Dawson went down to 168 for Ward. Oscar went down to 154 and 147 for Mayweather and Pacquiao.
GGG could go down to 154 if he wanted to. Pacquiao can go down to 140. Dawson went down to 168 for Ward. Oscar went down to 154 and 147 for Mayweather and Pacquiao.

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