Sumo is a Japanese martial art.
Because it was originally an event dedicated to the gods, it is distinct from entertainment-focused martial arts such as boxing and professional wrestling, where courtesy and decorum are respected.
For example, the highest-ranking Yokozuna is not allowed to trick his opponent into dodging at the start of a match.
They are expected to fight fairly and squarely.
Therefore, there will not be a champion of the thought that winning is the most important thing, like Mayweather.