KQ is the type of player that doesn't like to rush and level-up as soon as he can. He was older than most in HS and started his college career at 21. Then even if there were already overseas pro offers he still didn't immediately bite. It's telling that he mentioned he doesn't want to have a slow start to his pro career, he's the type of player who doesn't want to work his way up from the bench.
At this stage, unless the team he chooses is loaded in his position, I think he can be an instant impact player at the KBL level.
Him expecting a baby probably had a big part on his decision to stay (until the birth). I also think he's smart enough to know that he should turn pro after this season. Lastimosa's experience should serve as a reminder.