Did i read something on previous chapters About Hatsumi deserving what? 
type of person that gives oppinion without being asked to.
Did i read something on previous chapters About Hatsumi deserving what? 
It's a japanese manga, japanese character using japanese martial arts have plot armor. To not be called a racist mangaka, he just let the Sumo guy lose every single time.
@Numeris on this case i must disagree. It is "shuhari"
Hatsumi faced seriously deadly fighters since forever, but fear was holding his knowledge subconsciously untill now. Now that knowledge has exploded in his nervous system towards his own type of aiki-jujutsu