We all know already that he has the power, but now he is more faster and his punch are really that firm. But I would agree that it has to be tested on the higher weight class. Just maybe he will carry it but if he is not a natural featherweight, maybe he will encounter boxers that can withstand his power.
Anyhow, I'm not familiar with Japanese anime, but I'm sure he is a hero in Japan now, him and his brother both won in this fight and could be the next big Japanese superstar. But they should conquer the US and fight there.
He might already have that in mind on stepping on higher division which he could really test out his power.Sudden change on weight wont really be something simple yet this would greatly affect speed considering on the weight added and mass but adjustments would be there and he is really that aware of such changes but its not really that a bad idea on stepping up one higher if he do sees
that he could easily fit out or capable on beating people on higher rankings but we cant be sure on what would be the outcome if ever he do tends to step up
but just like others been saying that he has the power and speed.