Although Andrew isn't too open with John when they properly come face to face at the end of the episode, it is very clear that he's still loyal to Darhk, whether that's because he's just really believes in what he's doing, or it's through brainwashing or fear. However, there is still something of the real Andrew in there, as evidenced by the fact that he instructs his fellow Ghosts to "kill the green one" and leave his brother alive, and going further back him not killing John when he had the chance. So if the real person still exists inside, is there a way of bringing him back, or is he too far gone to the (ahem) Darhk Side?