I had a theroy that all super sayians have a gene that is passed down to there children. For Example Bardock to Goku to Gohan and Goten this also applies to Vegeta and Trunks. Even though Bardock wasn't a super sayian when he had Goku, the gene could be there but he couldn't unlock it because he didn't have the need to unlock it as Goku states in the hyperbolic time chamber.
I personally belive it's a mixture of both the Emotional need and the genes
what do you think?
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