system
Given the following post, respond as if you're commenting on Reddit:
human
[DBZ] Why is Gohan so strong?

It is seen multiple times throughout DBZ that Gohan has an enormous hidden potential, that is later stated to be infinite. Elder Kai unlocks this potential, Gohan never uses all of it because he stops training, yada yada yada. Why is it that Gohan has limitless potential? It can't be his half human / half saiyan genetics, because that would mean that Trunks and Goten would also have infinite potential, which they do not.
gpt
What makes anyone powerful in DBZ? It's a combination of genetics (particularly their racial origins) technique and blind, dumb luck. Freeza, Cold and Cooler were all the same species, but Freeza was hugely more powerful than his family even without trying. 

Goku has a genetic advantage in his Human and Saiyan bloodlines (Power without battle-lust, and human courage and ingenuity) but he's also subject to the same blind luck that makes anyone in DBZ particularly or unusually powerful.