Spydrmanjr wrote:Have we already discussed why King Ghidorah does not show up in the past and Godzilla is still apart of everyone's memories?
As mentioned by eabaker in that thread, the time travel theory Zarm comes up with (in the linked post) is essentially the same interpretation that had been written about in G-Fan #9 (May 1994) by Tom Miller:
It is important to remember that time travel doesn't exist; it is probably impossible even in theory due to the severe violations of cause and effect inherent in the concept. Despite (or because of) this, time travel has always been extremely popular in science fiction and fantasy. As a result of the innumerable manifestations of time travel in film and print, preconceived notions of it have developed. This is a mistake. There are no "laws" of time travel other than those created, explicitly or implicitly, by the author of the given story. Therefore, the approach in Godzilla vs King Ghidora cannot be: "How does this agree with what is known about time travel?" (since nothing is known about time travel). Rather, the question is: "What can be deduced about time travel from what the movie shows?" In other words, the facts mustn't conform to the theory, rather the theory must conform to the facts. Approached in this manner, it is easier to resolve the questions raised by Godzilla vs King Ghidora.
The primary lesson is that the past cannot be altered but the future can be changed by time travel to the past. What does this mean? When the time travellers removed the Godzillasaurus from Lagos Island in 1944, their own past was not altered. The result of their effort did not become manifest until their own time, the time they left Japan, 1992. This is why memories of Godzilla persisted and nothing that had happened prior to their time voyage was altered upon their return.
This is understandable by looking at cause and effect. What's past is past. The effect, Godzilla's removal to the Bering Sea, cannot occur until after the cause, the Futurians' departure in 1992. The same applies to King Ghidora. One might expect that King Ghidora had been ravaging Japan ever since he had been created by the A-bomb test near Lagos Island, but he hadn't. Time travel doesn't work that way in the movie. King Ghidora appears in 1992, when the time travellers return. Again, effect must follow cause. The results of changes to the past occur in the future.
He also explains that the time travel model in the film means there's no ripple/butterfly effect, where one changed event cascades into many changes over time.
This results in an understanding that's much less tidy than Keith Aiken's stable time loop theory, but it's the correct understanding based on what the movie shows and tells us.