The Upper Realm... Even though it was called one realm, it was in essence a group of five worlds, each having the densest elemental energy that no ordinary world could ever compare to.
Each of the five worlds was multiple times bigger than the world where Gabriel was born. If one was to compare, then Gabriel's world was not even one tenth the size of the smallest of the five upper realm worlds.
When one looks at the whole upper realm, Gabriel's world was only fiftieth the size. That was also why not many people paid attention to his world, until he came out of that place, and brought chaos to the upper realm along with him.
It was only at that point that the name of Earth started resounding in the Upper Realm, but only with hostility.