Re: super saiyan 3 & 4 gohan
I think maybe one idea is that Bebi forced control over Vegeta's body. I'm sure that is completly different than a saiyan being half human and half saiyan...I mean think about it? 1) Bebi forced himself into Veget's body, that obviously changed him almost entirely, he was barely even Vegeta anymore. 2) I'm sure that whole time Vegeta was doing something from inside trying to fight Bebi back out, I mean c'mon he is the most proud saiyan ever 3) Bebi taking over Vegeta's body took away most of the saiyan part of him.
That is all extremely different than just being born with half saiyan blood half human blood. I think even with half saiyan blood Gohan could still be consider a much more pure saiyan than Bebi Vegeta.
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