New Brevoort Formspring

Hi Tom! Thanks for taking all these questions! Question about the incursions: a universe is spared if their Earth is destroyed, right? We saw a Galactus destroy the Earth in the universe that Terrax The Truly Enlightened is from. With that universe now Earthless, it's spared from the threat of future incursions, right? Similarly, the universes that had Earths destroyed by the Cabal are safe? How then are there only ~24 now? Did something else happen to them? Rabum Alal? Thanks!