His technique at the age of 8 looked impressive, but if he's regularly competing fullcontact now at age 13, his body will have a high probability of being ruined before he reaches the age to be accepted at the big promotions.
only a fool will let there son at age 13 yrs old regularly compete in full contact this is not the path we choose. if it was then you would have by now seen alot of video of nainoa dung on the internet. he has trained along time with out contact and with the supporters and advisors behind nainoa dung it is unlikely he will burn out and unlikely they would let all his hard work go to waste. saying this now you understand that he will make it to the pro level and he will be training right.