Given that the author basically gave the Nue Minovsky magic particles to make it fly, even a nuke wouldn't be a guaranteed kill
(yes I know he said gravitons but I don't think there's even a case for those to exist anymore...)
I've decided I quite liked the Australian critter's design. A pity we likely won't get to see more of it, as all of the other kaiju are just here as a way to introduce The New Team who I'm guessing will shortly be en route to Hawaii. Speaking of which... wouldn't flying be dangerous for someone with a head injury?