https://youtu.be/UkigEfHmzh0?t=1247 So far he has never lost a fight. If he retires undefeated he is arguably the greatest boxer to ever live.
The only boxer with his health come first. I've never frankly heard of a fighter health come first until Floyd.
He's not the greatest but he'll definitely be in the argument due to his skills, longevity and the manner he was able to dominate mostly everyone he faced in his generation. Fighters from past generations were a lot better than the fighters today. This will hurt Floyd in the conversation but his skill is undeniable, even to haters.