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I feel like Zen'o didn't really erase all of the future timeline, but more so he erased a frame of time, which allows the present (and by association any concept of a future) to not exist. This could explain how the past can be so freely travelled to. Though I still don't understand Trunks's time machine travelling.
One of the most common time paradoxes, the Grandfather Paradox, suggests that if you go back in time and kill your grandfather so that your parents are never born, you will have never existed, so therefore how could you have time travelled?
This is not a cosmology thread, but an evaluation of how this wiki treats spacetime feats, and how we treat them in Dragon Ball.
So to suggest that Zen'o erased the whole timeline (nobody is saying he didn't) also suggests that Trunks and the time machine should've been erased, which would've made the plot of the show go far different. For one, no time machine or Trunks they wouldn't have been able to bring Zen'o back. Granted, MOST changes to timelines don't affect the past of the timeline, but rather reflect as a parallel world. The simplest way to explain this for those who've played Xenoverse is the main timeline is the story mode, but the branches are parallel quests.
I understand that existence erasure in DB generally doesn't affect the history/causality of timelines. However we consider destruction of a timeline as destroying ALL past/present/future. Discrepancies in time also effect timelines.
There were 5 time rings before the Black Arc happened, the silver being the main timeline, and there were 6 after Zen'o erased the future. Even if you include Beerus erasing Zamasu creating another timeline where he wasn't erased, the net change of existing timelines would still be off by 1, unless Whis had already restored the future before Gowasu opened the time ring box, which would explain why there was 6 rings and not 5 (or 4?). But that isn't directly supported.
https://zjcdn.********.me/store/manga/16093/04-026.0/compressed/d038.jpg
However, if going back in time to prevent the Black Arc from happening again is an event that actually happens, then the fight in the future never happens which would contradict this entire arc even existing, and it would also mean that Zen'o is never summoned to Earth to erase the timeline in the first place. It should also be noted that the only stated people capable of manipulating time without effecting causality are Whis who can only rewind three minutes, and a Kaioshin wearing the time ring. Otherwise, going back into the past and changing it creates a new timeline. In which case Zen'o destroying the timeline would be like "capable of doing it, and did it, but actually didn't". Unless there's some weird quantum superposition thing going on where the universe is both simultaneously erased and existing at the same time. One thing that’s for sure is going back in time before Zen’o erased the timeline doesn’t create a new one by Whis’s statements.
Also, if Zamasu truly merged with space and time at least by our standards, then if Zamasu merging with time meant he did so as past/present/future, then if Whis does go back in time in the same timeline, technically Zamasu should still exist in his universe form, unless he doesn't occupy all points in time for whatever reason.
TL;DR: Zeno erases timeline, Whis goes back in time in said timeline to a point before Zeno erasing it, which would be at least before Trunks's Majin Revival arc, which proves time in some aspect still exists.
Also...
Preventing Zamasu from ever destroying the future timeline ---> therefore Zeno never erased the future timeline (technically he did) --> therefore all events in the main timeline starting from Trunks using the time machine and onward never happened (technically they did).
How do we treat this where it makes sense?
I feel like Zen'o didn't really erase all of the future timeline, but more so he erased a frame of time, which allows the present (and by association any concept of a future) to not exist. This could explain how the past can be so freely travelled to. Though I still don't understand Trunks's time machine travelling.
One of the most common time paradoxes, the Grandfather Paradox, suggests that if you go back in time and kill your grandfather so that your parents are never born, you will have never existed, so therefore how could you have time travelled?
This is not a cosmology thread, but an evaluation of how this wiki treats spacetime feats, and how we treat them in Dragon Ball.
Backstory
When we see Zen'o destroy universes (specifically using U10 in this example), we see he is capable of non-local erasure. He erased U10 from inside the Null Realm, which included all except the Angel being erased while also inside the Null Realm, even property originating in that universe was erased.So to suggest that Zen'o erased the whole timeline (nobody is saying he didn't) also suggests that Trunks and the time machine should've been erased, which would've made the plot of the show go far different. For one, no time machine or Trunks they wouldn't have been able to bring Zen'o back. Granted, MOST changes to timelines don't affect the past of the timeline, but rather reflect as a parallel world. The simplest way to explain this for those who've played Xenoverse is the main timeline is the story mode, but the branches are parallel quests.
I understand that existence erasure in DB generally doesn't affect the history/causality of timelines. However we consider destruction of a timeline as destroying ALL past/present/future. Discrepancies in time also effect timelines.
There were 5 time rings before the Black Arc happened, the silver being the main timeline, and there were 6 after Zen'o erased the future. Even if you include Beerus erasing Zamasu creating another timeline where he wasn't erased, the net change of existing timelines would still be off by 1, unless Whis had already restored the future before Gowasu opened the time ring box, which would explain why there was 6 rings and not 5 (or 4?). But that isn't directly supported.
Whis's Actions + Paradox
Whis states that it is possible to go back in time to a point where Trunks's future wasn't erased, effectively having two copies of Trunks and Mai. However this is contradicted later in the Tournament of Power Arc with the examples above. If Whis could go back to a point in the timeline before it was erased, then that would logically mean that some part of the timeline still exists. He specifically states that he will warn Future Beerus to use a far better sealing technique than the mafuuba, as destroying Zamasu would just create another timeline and repeat the Black Arc again. This would mean that Whis would have to go back in time beyond Trunks's Majin Revival arc, as Shin was killed in the fight against Dabura, thus so was Beerus.https://zjcdn.********.me/store/manga/16093/04-026.0/compressed/d038.jpg
However, if going back in time to prevent the Black Arc from happening again is an event that actually happens, then the fight in the future never happens which would contradict this entire arc even existing, and it would also mean that Zen'o is never summoned to Earth to erase the timeline in the first place. It should also be noted that the only stated people capable of manipulating time without effecting causality are Whis who can only rewind three minutes, and a Kaioshin wearing the time ring. Otherwise, going back into the past and changing it creates a new timeline. In which case Zen'o destroying the timeline would be like "capable of doing it, and did it, but actually didn't". Unless there's some weird quantum superposition thing going on where the universe is both simultaneously erased and existing at the same time. One thing that’s for sure is going back in time before Zen’o erased the timeline doesn’t create a new one by Whis’s statements.
Also, if Zamasu truly merged with space and time at least by our standards, then if Zamasu merging with time meant he did so as past/present/future, then if Whis does go back in time in the same timeline, technically Zamasu should still exist in his universe form, unless he doesn't occupy all points in time for whatever reason.
TL;DR: Zeno erases timeline, Whis goes back in time in said timeline to a point before Zeno erasing it, which would be at least before Trunks's Majin Revival arc, which proves time in some aspect still exists.
Also...
Preventing Zamasu from ever destroying the future timeline ---> therefore Zeno never erased the future timeline (technically he did) --> therefore all events in the main timeline starting from Trunks using the time machine and onward never happened (technically they did).
How do we treat this where it makes sense?
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