Pac would have to fight some unknown fighters in his next few fights, lose by KO, buy a time machine, go back in time and lose some of his biggest fights. That should take Pac out of the Top 50 ATGs and closer to Joe Calzaghe somewhere in the Top 80-100 ATGs.
Tocker Pudwill Branko Sobot Mario Veit Twice Cadbury Salem Mger Mkrtchyan David Starie Rick Thornberry Miguel Angel Jiminez
In all honesty, this is a really good troll thread... Pac and Calzaghe are both top 100 fighters all time, sure, but Pac is top 30 whereas Calzaghe is not.