>>105360806It's kind of surprising to me that other writers seem to dislike the interdimensional stuff so much. In the beginning of the new 52, they did push to make the New Gods unique in the multiverse but it didn't really feel like the idea was seen with enough weight and eventually even that was dropped due to Earth-2 being a mess and Johns wanting to do his own take on some characters.
After Final Crisis, only Morrison himself directly referenced it in Multiversity, and even explained it there are "emanations" that were unaware of their real selves, which is why they act like random aliens. So, he knew people were just ignoring his concept and came up with an explanation for it.
>>105361346Fifth World is Earth after it evolves into a land of super humans, not the current one.
The original idea behind the Third World is that it was the era of myth, where the Olympians, Asgardians and such ruled, but Johns since his JSA run with KC Superman and Gog/Magog has pushed the third world to be just an unknown fourth world-like DC comics exclusive superland. The recent Green Lantern story went in that direction too.