Superman cries more than any superhero.
Okay.....here's my theory.
This Earth is where all the DC heroes go when they die. According to the Monitors, Kyle Rayner and Donna Troy are supposed to be dead, Mary Marvel is in critical condition/dying, Wally West or Barry Allen? is missing, E-2 Superman and E-2 Wonder Woman (although they don't appear to be from E-2) went somewhere else, Mister Miracle could be dead ( I never completely grasped Morrison's Seven Soldiers). Ted Kord, Maxwell Lord, Jade, and the Question all appear to be missing legs and arms as if they didn't phase correctly into the new reality. I am not sure about the other heroes.