Hey, it isn't my theory. I'm just going by what Pegg, who wrote the new film, said.
Again though, personally I don't see any reason why anything about the Franklin and her captain need be interpreted as resulting from Nero and Spock's time travel. (And as for the "Warp 4" thing specifically, while we don't necessarily have to go this route either, I and others have pointed out that the warp scale could have been recalibrated after ENT much as it was between TOS and TNG. Maybe the Franklin's "Warp 4" is faster than Archer's "Warp 5" in the same way Janeway's "Warp 10" was faster than Kirk's "Warp 11" and she isn't really a pre-ENT ship at all.)
What about Deadpool, Angel, Psylocke, etc.? I think the filmmakers are using the time travel in DOFP as an excuse for why there can be entirely different versions of the same characters both before and after that point. But whatever, off topic.No, the "X-Men" movies just have bad continuity and plot holes, unrelated to the time travel in the last two movies.
Is there really any such thing as a "single timeline" though? Is there really any such thing as "past" or "future" even, or are those simply illusions that we perceive from our limited viewpoint? Heck if I know. And even if the real world is one way, why should fiction have to follow that? It operates by whatever rules and dynamics the people who write it imagine it does. I mean, that's the real fact of the matter. Actual physics doesn't really come into it. There might or might not really be a God, but if the writer of a story postulates that there is one, then there is one in that story. If the writer postulates that there isn't one, then there isn't. I might like it or not, consider it to make sense or not, but that isn't really the point. It ain't up to me or you to say "no, it doesn't work like that" if the writer says it does, because it's not real, it's a fantasy. Is it really possible to travel at infinite speed? If it were, would doing so cause a human to turn into a salamander? Probably not. But that's ultimately irrelevant to the fiction.causality cannot travel backwards within a single timeline
Again though, personally I don't see any reason why anything about the Franklin and her captain need be interpreted as resulting from Nero and Spock's time travel. (And as for the "Warp 4" thing specifically, while we don't necessarily have to go this route either, I and others have pointed out that the warp scale could have been recalibrated after ENT much as it was between TOS and TNG. Maybe the Franklin's "Warp 4" is faster than Archer's "Warp 5" in the same way Janeway's "Warp 10" was faster than Kirk's "Warp 11" and she isn't really a pre-ENT ship at all.)