The thing is...there are 4 concurrent DC Superero shows right now on CW...that's really pushing it, making for oversaturation.
All the more reason to set them in two different universes (with occasional crossover) to make them more distinct.
I dunno, it's just my perfectionism talking -- there will now be a DC superhero show at 8 PM every weeknight except Friday, so I want a fifth to complete the set!
