He was pretty insignificant before the Cell arc, honestly.
Not a cheap shot, though. Gohan legitimately surpassed Raditz when he got angry.
He still crushed Vegeeta when he fell on him as a giant monkey.
For all we knew, he could've been raped or something.
Vegeeta doesn't even know Gokuu that well at this point.
https://en.wikipedia.org/wiki/Mary_Kay_Letourneau
He could've just been born before Gohan.
Yajirobeh hid for the whole fight and only popped up to land two cheap shots while Vegeeta was distracted. That's not relevance, but plot convenience. It's his fault that Vegeeta dodged the Genkidama, too. No matter how you slice it, Yajirobeh is a minor character who rarely even shows up. Two...
Do you not know the concept of illegitimate children?
Most 12 year olds have started puberty and are thus capable of reproducing.
And Trunks only revealed his age after Vegeeta's comment.
Just because one hybrid has black hair doesn't mean all will. In Gohan's case, his parents and both sets of his grandparents all had black hair.
@SSJ2 What chu DOING
Can you not read? He could've just been Gokuu's son for all Vegeeta knew.
Trunks was obviously part Saiyan as he could turn Super Saiyan. At the same time, he's used to Earth and his hair isn't black, so he was obviously part Earthling.
Vegeeta: The only remaining Saiyans are myself, Kakarott, and Kakarott's half-breed son! Besides, you don't even have black hair!
Common sense: But what if he's half Earthling like Gohan? I mean, we can clearly see he's used to being on Earth. His hair isn't black, but he could've just...