There's a fan theory that John Diggle on Arrow would someday become a Green Lantern.
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Arrow has dropped hints at this before, but never so blatantly as in "Spartan."
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The first nod came in Elseworlds, where The Flash of Earth-90 recognized Diggle.
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The Earth-90 Flash said John wasn't wearing his ring - a clear nod to Green Lantern.
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"Spartan" saw Team Arrow thwarting a Ninth Circle plot to steal military secrets.
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Diggle said he had a contact who might be able to help them out.
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The contact was later identified as Diggle's estranged stepfather - General Roy Stewart.
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This means there's some Earth where John Diggle is John Stewart and a Green Lantern.
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