Saiga wrote:Meh, I don't like it. Grade III is a crappy form, and Trunks abandoned it to master the Super Saiyan form like the others. Why go back and master Grade III when it is inferior? And if he went to the effort to do that, why wouldn't he aim for SS2 instead, which is far superior?
Only 10 years have passed from Trunks point of view and, like he said, he has been busy rebuilding the world. Vegeta has been training for 30 years and he hasn't been busy with nothing else.
Those are the reasons why Trunks hasn't reached SSJ2 yet. If he trained as hard as his father, 10 years would probably be enough for him to reach the form (since Vegeta did it within 7 years) but he has been busy like he said.
But he also has been training, he has improved, and even though he still hasn't reached SSJ2, he has developed his techniques, including the Grade forms, to be more effective.