There were so many amazing easter eggs that came out of “Elseworlds,” but one that’s really delighted fans is a brief line that seems to make a long-held theory canon.

If you’ve been an Arrow fan for a while, you might have heard the theories that John Diggle is a version of John Stewart, a member of the Green Lantern Corps in the comics. Well, in “Elseworlds,” John Wesley Shipp’s Flash from Earth-90 crossed over to Earth-1 to issue a dire warning to the Arrowverse heroes. However, he became distracted when he noticed Diggle. “John?” he questioned, suggesting the pair are old friends. “Where’s your ring?”

The implication here is obvious: Diggle’s doppelganger on Earth-90 is a Green Lantern – the ring that Flash-90 was referring to naturally being the green power ring. No doubt actor David Ramsay loved this, too, as he pretty much suggested...