So what you're implying is excuse making for a win is OK, excuse making when you lose not OK? To me it's the same exact thing and nearly identical circumstances. Floyd hurt his shoulder prior to the fight, looked bad enough to where most people thought he lost the fight and he said his rotator cuff was fucked up, thus the reason for his poor performance. Likewise Manny didn't look good, lost and said his rotator cuff was fucked up, thus the reason he looked bad. At the end of the day they are both excuses. It's not the reason Floyd should have lost to Castillo and it's not the reason Pac lost to Floyd.
Regardless, I'm glad this fight is finally over and there should finally be an end now as to who would win in a fight between the two - Floyd. Mayweather has proven himself to be the better boxer, the best fighter in our generation. His all time great hall of fame legacy is firmly cemented, there is no doubt he is the best in our time. He's proven himself. He'll be even more appreciated after he retires I'm sure.