Originally posted by Kento
That's completely different. It's not potential for Gohan. It's not something he could train and achieve but doesn't it's something he has already but can't use without getting very angry.And we never really see how powerful Present Trunks gets except that he and Goten are nearly equal with 18 as kids so it's really impossible to say if Trunks surpassed Future Trunks or got weaker in those ten years at the End of Z than as a kid.
I can see your point, but Gohan's Mystic power isn't static- if it were, then Vegeta and Goku would be guaranteed to surpass it with training, due to the warrior race thing. So just by having his true power unlocked, that doesn't mean that it won't increase or decrease with training/lack thereof. It's true that it'll never decrease to the same extent as it would without the mystic power, but the fact that he doesn't train at all means it'll drop off pretty quick compared to Vegeta and Goku. For example, in the 7 years between the Cell Games and the Majin Buu saga, Vegeta's power increased enormously, to 70,000,000 in fight with Pui Pui, whereas Gohan's power dropped to 78, 000, 000 in Super Saiyan 1. Once Gohan started training again it increased reasonably quickly, but he was still far weaker than Vegeta and Goku in the same form.