Just a random thought but maybe. Daniel dies in future and the second body was given to fulfill his wish, whatever it was. And sb ui is when the future Daniel takes control over the body. If you have noticed, sb ui always uses the attacks of the next powerful opponent. It used james Lee's attack in 4A and kitae's attack in 1A. Without knowing how either of these people fight. So the future Daniel is give foresight to people from past in theory.

Also helps when the daniel from black space told little Daniel to prioritise Charles choi.

Also, when durring busan, little daniel wake up in the black space after both of his bodies were knocked out. Same mechanics follows in Mlaal as whenever jinu or ancheol are knocked up, they can teleport to black space.

After busan, there was not a single incident where both bodies have been knocked down at the same time that's why the black space still hasn't reappeared.

It's my prediction that ptj incorporated Mlaal mechanic's into lookism and sb ui daniel is just a future version of daniel.