If you take a moment and thing about the storytelling ramifications of bringing the Earth-2 Laurel Lance to Star City, you get the idea that things on Arrow might be getting a bit complicated with season six. Katie Cassidy has been promoted to series regular again, which means this version of Laurel Lance is going to be around a lot… but Laurel Lance was a former prosecutor and had her identity as Black Canary revealed after her death. She was also the daughter of the former police captain and current deputy mayor, Quentin Lance (Paul Blackthorne) and the ex-girlfriend of the mayor, Oliver Queen (Stephen Amell).
Amell told EW.com:
She looks exactly like Laurel Lance, she is Laurel Lance. Laurel Lance is the most famous dead person in Star City, so eventually, at some point, if she is reintroduced into public life, how do we unpack that? I'm excited for that. That's the dynamic I think could be interesting.
So, where it's natural for fans of the series to focus on what having Black Siren around means for Team Arrow and having an evil person who looks exactly like Laurel mans emotionally for Quentin and Oliver… the first time she shows up on a camera and the newspapers get it, that's going to cause a problem. And you can't really have Harrison Wells (Tom Cavanagh) swing by and explain the whole thing to the city… partly because multiple Earths is a big concept and partly because he too is from Earth-2 and famously dead on Earth-1. Damn it, Barry!
Plus, we're supposed to get more of her Earth-2 backstory. What was her connection to Oliver, her relationship like with that Quentin and what about Sara (Caity Lotz)?