this question was about why Trunks didnt have the same power as Gohan when they are both saiyan-human hybrids. This was true in Dragon Ball Z, but now in Dragon Ball Super they made Trunks to be the first to get the super saiyan rage transformation, that by the time he gets it for the first time, it makes him able to fight Goku Black super saiyan rose, something that Goku and Vegeta couldnt do by that time (later with training and power from becoming angry and kaioken, Goku and Vegeta can also be a match to Goku Black super saiyan rose, or overpower him, but after Trunks did it for the first time)
The topic was first flagged because it was marked only "Dragon Ball Z" (so what could happen in Dragon Ball Super wouldnt count), and probably also because many people didnt like and couldnt accept at first the fact of how strong Trunks became so quickly, at first people was even having doubt if he had a new transformation, there was much noise about it for some weeks when these episodes appeared, one member who flagged said the answer "wasnt credible".
But later how powerful Trunks became was reaffirmed in the following episodes, even being the one who defeats merged Zamasu at the end. So the right answer is deleted, and I assume that if I post the same post again is going to get deleted again?
I ask you to reconsider undeleting the answer, so the topic can have a meaningful answer. Or post one yourself with the info I just posted here.
By the way, the answer isn't a one liner, it's 2 lines and there isn't much to add to the answer to explain it, perhaps that Trunks got a new transformation no one else got before, and that he showed to have hidden power as Gohan had