User blog comment:PabloDePablo/Upcoming fan fiction: Less than Normal/@comment-16601872-20131130012502/@comment-1598577-20131130013940

No, they weren't.

For starters, Future Trunks has never gone Super Saiyan 2 in the anime, so why would he suddenly be able to do so in Bojack? Secondly, the tell-tale signs of a Super Saiyan 2 (hair more prominently spiked, electricity in aura) aren't really there. If anything, the signs point towards Vegeta and Future Trunks point towards them using Ascended Super Saiyan (due to slightly increased muscle mass) if not just Super Saiyan.

Third, what would trigger such a transformation? Looking at the anime, the only thing pre-Buu that would trigger Vegeta's transformation into Super Saiyan 2 would be Future Trunks dying, and he didn't transform then. The only thing Future Trunks did between his revival and Bojack was go to the future and kill the Androids, so I don't see anything for him to go SS2 over.

I won't spoil Vegeta's transformation into a Super Saiyan 2, as it's a saga or two away, but it will be well after Bojack Unbound and will what I think is a solid reasoning behind it. Future Trunks won't be appearing anyways, so he won't go Super Saiyan 2. All in all, I feel like neither of the two characters achieved or used Super Saiyan 2 before or during Bojack Unbound.