The verdict’s still out on whether Diggle will be joining the Green Lantern series at all, but the ties are all there should HBO Max execs decide to formally link Green Lantern with the Arrowverse.
Having a higher production value doesn’t necessarily mean that the Green Lantern series will be completely separate from the Arrowverse shows.
What’s more, Arrow’s series finale teased David Ramsey’s John Diggle finding a mysterious box that glowed green when he opened it.
Oa, the Green Lantern Corps’ base planet, was seen in the “Crisis on Infinite Earths” crossover.