@Sparda's rejected son
The Majin spell is what boosted his ability & put him on the level of SuperSaiyan 2.
This is a misconception,majin seal only released the evil inside Vegeta it didn't boost his power it merely gave his body more resilience.
IMHO Akira should just stop with the increasing power levels already and go back to more skills&technique focused fights like dragonball saiyans have already gotten as strong as they logically could.
Akira should just send goku to a hiatus and focus on ultimate gohan&vegeta as they clearly are better characters than him,they were underplayed in buu saga just because goku was the main character.
One of the reason why DBGT is so bad is because it focused too much on goku and reduced all the other established characters into meatshields for goku.