Board Thread:Arrow discussions/@comment-9346948-20170302010704/@comment-3221148-20170302092742

So, according to Wendy Mericle, Adrian is legit Prometheus:

"One of the reasons we did do it was because everybody would be thinking, 'Of course he's going to be Vigilante," she told reporters in a recent interview. "We thought it would be a really fun twist to do what we've always done on the show which is to take the comic book mythology and turn it on its head and see what kind of story we can mine from a surprise like that. It was also something different for this season. We wanted to change up how we introduced the big bad and change up when we did it, how we did it, and hopefully we succeeded in that this year."

Josh Segarra also fell into the trap of thinking he'd be playing Vigilante. Though the executive producers on the show described his character as the Big Bad of the season, once he found out he'd be playing Adrian Chase, he initially figured he'd be playing Chase's comic book alter ego. Segarra found out the hard way when he got to set to start filming that he'd actually be playing the season's villain.

http://www.ign.com/articles/2017/03/02/arrow-showrunner-and-prometheus-actor-explain-the-season-5-villains-reveal

Then again, this is from Wendy 'FLASHPOINT LAUREL' Mericle