Easter Egg !
Is there a reference to this movie (and/or to Hades) in game ?
Have a look at this scene where Cloud and Aerith meet at the start of the game.
Isn't there a kind of giant DVD sleeve in the middle ?
What can you read in capital red letters ?
"IN OUT DEATH".
Is Midgar Hell ?
Is this place a gate like in the movie ?
If so... did Aerith enters Midgar from this green light in the alley ?
Is she the innocent flower lady that she seems to be ?
Advanced theory developed