An to establish the best fighter we utilise a subjective, common sense approach which elects the fighter not on his achievemnets but on his potential achievements.
If you believe as you claim that Mayweather was the best at 140 you completely disregard the thought that to be the best fighter in a division you must beat the best fighters in the division.
You disregard the well established use of rankings and unifications. Could Mayweather have beaten Hatton and Tszyu? yes.,
did he? no.
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