Fans of Green Lantern, Arrow, and David Ramsey have long speculated that John Diggle may actually be John Stewart.
The fan theory is that when Diggle was in the military, he changed his name (for whatever reason).
Now it's learned that the theory might not be too far off as David Ramsey has confirmed there are talks that Diggle might become Green Lantern.
Ramsey confirms the Green Lantern possibility in a recent interview (via Screen Rant):
"Is John Diggle John Stewart? I cannot say 'yes,' and I cannot say, 'no.' I’m serious! I do know that there is serious discussion about whether or not this guy becomes John Stewart. But, I mean, I’ll say this: it is top secret. I’ve asked them and they’re like, 'we’re working on some stuff.' If that’s the case, it’s gonna be huge. This is the stuff they want to avoid. I think they don’t want anybody to know yet and they haven’t even told me. But they have told me that they are thinking about it and that they are considering it. But they’re not going to release anything yet. That’s exactly what they told me. Greg Berlanti told me that. Andrew [Kreisberg] and Marc [Guggenheim] have told me that. I haven’t spoken to Geoff Johns about it. But that’s the word from people directly involved in Arrow- that they’re working on something.
"Here’s the truth of it: if I knew, I would tell you I know the answer to that, but I’m not at liberty to tell you that. I would answer like that. I probably wouldn’t tell you anyway, but I would at least tell you that I know. I honestly do not know.”
Cosmic Book News was previously told that plans for Green Lantern in the Arrow universe are underway and that Green Lantern would crossover with The Flash. Just three weeks ago also saw mention there are plans for more spinoffs as well.
“Now, boy we’ve referenced Ferris Air a lot. It would be really cool to have Green Lantern," Ramsey added. "Hopefully, that happens. I have no inside information, unless I do.”