If Future Trunks grew up in a peaceful situation, going to school and living a normal civilian life, then it would make perfect sense why he didn’t become a Super Saiyan until his adolescence.

He battled against the Androids 2 on 1, but even after mastering Super Saiyan it wasn't enough. As Trunks aged, he began training him with the hopes of having someone that could fight alongside him.

With the Warriors in Black and the Z-Fighters teaming up to take on the demon dimension, Gohan Black’s status is anyone’s guess. Dragon Ball Heroes: Future Fighters ...