Future Trunks and Kefla master the Super ... Gohan was at the very heights of his powers during the Cell Games. Him unlocking Super Saiyan 2 was critical to best Cell, which is why it's a crying ...

Training with the Supreme Kai helps Trunks unlock Super Saiyan 2 and even defeat Dabura ... and later helps Gohan & Piccolo ...

This ending is overly depressing, invalidates both the entire arc & DBZ's Cell Saga ... the debuts of Super Saiyan Blue ...