Moon Tae-jong's son doesn't seem to have the skill to be a top-tier domestic player

It seems they aren't pursuing naturalization because if Moon Tae-jong's son, who is moving to the KBL, doesn't have the skill to be a top-tier domestic player (2nd option), they wouldn't use a foreign player slot to pick him as a 2nd option.
I wonder which league Moon Tae-jong's son can continue his career in after graduating from university.
He wouldn't even be able to play as an Asian Quarter player in Japan, and his skill level for the domestic 2nd option slot in Korea is also ambiguous.