Roy Jones moved up from middle, supermiddle, light heavy to heavy.
calzaghe has stayed at supermiddle his entire career, and hasn't really gotten out of his comfort zone and tested himself, yet other great fighters all move up in weight.
Mosley, mayweather, duran, to name a few.
It would be relatively easy staying in the same division and defending your title and staying undefeated, as opposed to moving up and testing yourself.
calzaghe has stayed at supermiddle his entire career, and hasn't really gotten out of his comfort zone and tested himself, yet other great fighters all move up in weight.
Mosley, mayweather, duran, to name a few.
It would be relatively easy staying in the same division and defending your title and staying undefeated, as opposed to moving up and testing yourself.
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