So let me get this straight.... (Spoilers)
This film takes place in an alternate line of continuity in which the original Godzilla wasn't killed off by the Oxygen Destroyer, but rather was simply driven back as he was in the scene prior to his destruction? And that, by extension, the Godzilla seen in Godzilla 2000 was also the original Godzilla returned?
I thought that maybe he was Junior Godzilla grown to adulthood after the second one died in Godzilla versus Destroyah. I never thought that they would turn around and say, oh hey, that's the original one. He didn't die in this line of continuity. Craziness, sheer craziness.
It does make the film more interesting though.