It actually wouldn't. Since currently all Godzilla monster units exist only in my mind, I am toying with an idea for a Civolution mod in the meantime. Basically with all-animal civs that can take different evolutionary paths, eventually leading to early man or manlike-creatures (Skaven, Goblins, and Gnolls might be alternate paths). There will be 2 culture groups - Warm-Blooded and Cold-Blooded, and I will use traits/flavors to influence and vary the AI civs evolution. Some of the evolutionary paths will mimic what Earth did, some obviously will go deep into the 'what-if' territory. So I am looking for animal-only units of any type at this point.
These units unmanned might make a good pre-dragon for the Cold-Blooded Civs. They would upgrade to Dragons basically because dragons are supposed to be bigger, more powerful, and have forearms.