May weather does a lot of things that good fighters would make him pay for. Watch the fight again. Try and count the times somebody is off balance. Try and count the times somebody gets caught with their weight on one foot (watch Floyd jab).
Floyd benefits from fighting guys that are real good against guys that don't fight back. PAC had no solution for a guy that contested control of range; he looked like an amateur. Also PAC doesn't throw combinations, which are purposeful sequences of punches. He throws 'flurries'