Yes I totally agree and another one I think of is the fantastic 4, Duran beat leonard, Hearns KO'd Duran, Hagler KO'd Hearns, Leonard beat Hagler.
In Donnys example the only man to beat all the others was Ali and in mine it was Leonard and don't ask me why but I get the feeling that it could be Williams that has the beating of everyone else in this era (I'll avoid saying division as it could well go into various divisions as the above did). The fighters for me that we will be talking about could be:
Cotto
Margarito
Williams
Cintron
Judah
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