I still have a few problems with this theory.
In the main story and the tie-ins we see the Chaos King invading the various realms of the universe. But we never see him doing it to any number designated-universe.
Amadeus Cho estimated that 98.76% of the multiverse had been destroyed, which only makes sense if the size of the multiverse is finite.
Hercules asked Eternity—the universe—to help him fight the Chaos King.
Amadeus Cho and Galactus attempted to escape the "multiverse" to Hera's realm which technically should be part of the 616.
