The same situation could easily happen again with this Green Lantern Easter egg, and showrunners are just getting out ahead of things before rumors spiral out of control.
Of course, with DC working on a Green Lantern Corps film, this could be a case of where it’s not eager to have a Green Lantern appear in the Arrow-verse.
Such things have happened before, and despite a Harley Quinn tease in Arrow’s early seasons, the villainess has yet to appear in front of the camera in any non-deleted scenes.