We know Mid-Childa has ruins on it; just look at Ixy's original resting place. As for the manga, it doesn't necessarily matter to the main 'verse--the movie manga itself is an alternate reality from the movie, which in itself is an alternate reality (or a movie, if you accept the Megami soundstages as canon) to the anime.
That said, movie manga discussion really should be taken to the general manga thread.
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