huh? Vegeta's ability is to go great ape. That is like saying Naruto has to go SM to beat Sasuke, if he can control it, then why not use it? Vegeta was capable of toying with the Android 19, although Goku would've been capable of beating it, saying he could've done what Vegeta did is fallacious. Vegeta ripped off its arms and smashed it with a big bang attack after his energy was heavily absorbed (he let it). Goku couldn't do the same, he could win, but not with the relative ease Vegeta had. Moreover, with the virus, Goku was much weaker, meaning in this point of time, he was indeed weaker than Vegeta, so your point isn't refuting anything. The name of the manga doesn't mean much. Bleach's main character is clearly Ichigo, does it mean Ichigo isn't as much of a main character as Naruto is in 'Naruto'? Same applies for DBZ, only because the manga isn't called 'Goku' doesn't mean Goku wasn't the main character in Dragon Ball (and DBZ). The name doesn't imply much, other then stating the most important thing or the main character of the manga. Your point is rather delusional.