Again, to mess with Diana. Why would he be walking around 1984 in 1917 clothing? That wouldn't make sense. Maybe he would want her to think that he was resurrected. Also, why would Patty tell us a plot point of a story. Of course she is going to play with the fans and make them think he is back for real, and then throw the surprise on him.
Um, isn't he a telepath? And you're so quick to make Hades a villain to Diana, but isn't he dead along with the other gods? Or even if he isn't, Psycho could be a pawn of Hades.