User blog comment:Eobard95/OLICITY IS ENDGAME AND I'M DONE WITH ARROW BECAUSE OF IT!/@comment-27673963-20170505072754/@comment-26624146-20170506032300

And who says Slade can't "Keep his promise"? Maybe Adrian anticipates Oliver seeking Slade out for help and gives him the task as Slade then lets Oliver believe he's Team Arrow, only to reveal he's really Team Prometheus when he's least expecting it.