It's clear that Kotaro has become a lot more aware of how strong he is despite how small he is. He's practically a mini me of his papa, though he's yet to train properly. It's clear that he wants to be as tough and big as Kentaro, and acts as something of his own interpretation of him. His idea of his dad seems to lack his subtlety and humility, but he'll learn some day. If anything, it means he might grow up to be as much of a good guy as his daddy.

Kentaro is to me
Kotaro is to me and  jazzanovawolf