Arrow loves flashbacks. It's a show that spent five years with serialized flashbacks and used them for other characters as well. We saw a goth Felicity (Emily Bett Rickards), a married Rene (Rick Gonzalez), and Diggle (David Ramsey) in Afghanistan. We know other things about the characters' pasts, like Rene met Quentin Lance (Paul Blackthorne) when he was a beat cop and Curtis Holt (Echo Kellum) was an Olympian. But all we seem to know about John Diggle was that he had a brother and he was in the military. All of Diggle's flashback have been about his time in Afghanistan.
Executive producer Marc Guggenheim to TVLine that the show will continue doing character-focused flashbacks:
"We are going to do character-centered flashbacks and we're very cognizant of the fact that we've never done a non-military flashback for Diggle. It's something we talk about a lot but we have to marry it to the right story."
And while the opportunity to do a non-military Diggle flashback has yet come up, we can expect to see "some really cool Slade Wilson flashbacks that I'm really excited about." Those are likely to take place in episodes five and six of this season as Oliver (Stephen Amell) helps Slade (Manu Bennett) find his son.
Arrow airs Thursdays at 9 p.m. ET on the CW.