When you want to become a Chef, you go to school and you are taught how to do things a certain way. You learn the fundamentals of cooking, baking, etc. Once you become a Chef you begin to create your own cooking methods, trying separate yourself from the rest.
Same thing.
I like davids answer.
The only thing I would add is his speed and intellegence are off the charts.
Every boxing trainer teaches something differently.
Don't think that your boxing trainer is everybody's trainer.
Once you get to that level you can put in your own style into it
Maybe that's why he's so successful and others aren't.
For example, my trainers say slip and weave with your legs, not your back, but Floyd Mayweather majority of the time uses just his whole upper body to slip and weave. People and trainers always say to move side to side not forward and back, but alot of the times Floyd Mayweather moves away from punches backwards. He even has a whole different blocking stance and style. How come Floyd Mayweather boxes the way he does and everyone else is taught one specific way? How does a boxer even develop his own style if he's taught to do certain things a certain way?