Both [physical and emotional], and what that does to him, what that does to the team or does to his family will be very interesting… John Diggle, sergeant major, four tours in Afghanistan, married, divorced, married again, has a child, vigilante, father, husband, is probably the most evolved character on the show, arguably. I was talking to [executive producers] Marc [Guggenheim] and Wendy [Mericle], and we all seem to agree. I think you’re going to see Diggle in a way, unlike his brother coming back from the dead and killing his brother and leading to the death of Canary and going to jail and getting out, unlike all those things where we see things that Diggle can recover from. I think in Season 6 you’re gonna see Diggle be broken in a way he’s never been broken. And it starts in 601. It starts in the first episode. So I think you’re gonna see a dramatic change in what Diggle really has to deal with on an emotional and physical level in a way we haven’t seen.
David Ramsey reveales some of what will happen in Season 6 with Diggle [Cinemablend.com SDCC July 2017]