Numeris's comments

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. 

The inconsistency in powerscaling is becoming more and more stupid. You can't write a character on par at start with his siblings at the same age, except the big sister (labelled as an ultra genius) and then after giving him 18, yeah 18 i counted, powerboost/training session he is still struggling against an average flag bearer who didn't get all the boost and advantage he got, this make no sense...
Author made his MC so powerfull, people around him are catching up faster for the sole reason they are older...

Let's overcome slowness with speed. What a genius.

So, the whole plot is the same as DBZ Mirai Trunk arc?