Floyd had a motivation to be the goat
Theres something really powerful in that which allows you to continue bringing the best out of yourself long after you're already set for life.
Conor wanted to be one of the best and hold 2 belts along with making an absurd amount of money. When he attained that goal though, it seems like he lost some of the fire which allowed him to reach them in the first place which isn't uncommon.
Athletes like Floyd are special because they continually move the athletic goalpost and strive for higher heights.
As of now Conor hasn't really shown to be that guy, his last fight he seemed to be a shell of himself mentally. It takes a special kind of person who in spite of already having everything in the world, dealing with the pressures, temptations of Hollywood and the entertainment industry.. Continues to move forward and perform at their highest potential, what allowed them to reach the top in the first place.
Floyd is special in that sense for sure. Much like Lebron or innumerable other elite athletes who continue performing at the highest level.
Conor can perhaps still turn it around though and regain what he has lost but that's entirely up to him