It should be interesting to see if the villain has a sudden lightbulb moment of realization that the Green Arrow is actually the same vigilante as the Arrow who had presumedly died in Season 3.
He has a very personal grudge and axe to grind with Oliver and he’s going to come at him in a really interesting, sociopathic kind of way.
He evidently has good enough vision to see out of his Scarecrow-esque mask and hood, so maybe he just had clear enough vision to see that they are totally the exact same person.
Given the fact that Prometheus is being introduced in Season 5 as a way to connect the show to Season 1, we can probably bet that this plan to strike back against Oliver has been forming for about four years now.