Even goku stated that gohan hasnt did as much as training and fighting as he did in his life time, and gohan surpassed him without knowing.
You sure he didn't say. "He's been fighting along side us this whole time and still being able to keep up.". Cause Gohan fought in every arc.
Cell stated that trunks was more powerful than him but lacked speed, imagine if trunks trasformed properly.
Cell as holding back. If Trunks went ssj2 then Cell would have went full power and kill Trunks. Gohan > Trunks by a big deal till Trunks went into the ROSAT for the second time. Then the gap got smaller.
Dragon Ball Online is a perfect example of Future Trunks Having His Own Series. And doesnt have to be the only character he could meet new friends in his time travel..
That's not Future Trunks through. There's no logical Trunks for that. Besides Majin Boo here's no logical way someone to be as strong as Cell. Trunks has no reason to time travel no more. His troubles are done. Let's pretend if Namek blows up.Trunks would't care and neither would Bulma. They would only care or realize something bad happen if they go to Earth.
After Majin Buu's defeat, the supreme kai and elder kai could introduce future trunks to a even higher kai, a special kai in which governs and watches over all timelines. His observation of future trunks's time travel potential allows him to recruit future trunks as a warrior time. In collect the jikan star dragon balls, in order to save existence. Thats a example summary, I have a few more.
That is honestly bad. We don't even need a Kai of time. That's just over kill and very well not needed. Why would there be a time Dragonball anyways? That's honestly a worst idea than the Black Star Dragonball. Only Nameks can create dragonballs. The idea of that is honestly bad. Unless Trunks matches Goku(Boo Arc), Vegeta(Majin and Post Majin), or SSJ2 Gohan(Rage and Cell games) or at least become 90% of them he won't be impressive.
You see, if guys think about it, Future Trunks Timeline is leaves room for a lot of new ideas, heroes, villians and sagas, because his timeline has become so distinct from the present timeline. The series can focus around trunks collecting the jikan dragon balls seperated through out different timelines, he must collect them before they get into the wrong hands, or to restore order with time itself.
Future timeline doesn't lead to new ideas. A kid named Trunks grew up in hell and as an adult he become a warrior and killed the androids so he could live in peace. Yes he might do some type of basic training so it won't get rusty but I'm sure he retired from fighting and only train so his power won't go away JUST in-case. Let's say Trunks created other timelines because he time travel since the manga hints that. Would't time travel create NEW timelines. Also would't the time Dragonballs be complete stupid? If they restore order in time would't that kill the other timelines? Think about. All but the original Timeline(Trunks's as hinted in manga) would be destroyed.
Just because Trunks is badass or a fan favorite doesn't mean he needs his own series. His timeline is in peace now. He deserves peace.