I was thinking that calling him Simon Morrison was a swerve to preserve the Vigilante character, and am hoping that's the case.
Give them some credit. It wasn't a "swerve," it was a deliberate misdirect. It's the same move
The Flash used last season with "Jay Garrick"/Hunter Zolomon -- introduce one comics character and throw off the audience as to his true identity by having him adopt the name of another comics character as an alias.
Chase's whole story arc throughout the season fits him being Prometheus. He was a character who earned Oliver's trust early on, who got Oliver to listen to his advice and guidance. In their very first meeting, "Chase" told Oliver that the latter had stolen the former's girlfriend, but "It's okay, I don't hold grudges" -- a line that, in retrospect, was no doubt meant as ironic foreshadowing. He initially showed a fierce resentment toward vigilantes, which we were supposed to think was a cover for his identity as
the Vigilante, but which can now be seen as a clue to his real resentment toward the Hood/Green Arrow. When "Chase" heard that the media had coined Prometheus the Throwing Star Killer, he remarked that it had a certain flair to it. Plus we learned around the same time that Prometheus had to be someone affiliated with Star City law enforcement, able to steal Oliver's old arrowheads from evidence lockup. Later, "Chase" gave Oliver suggestions that turned out to play into Prometheus's hands, like covering up the Green Arrow's involvement in Malone's death.
Conversely, I always felt that there seemed to be a disconnect between "Chase" and Vigilante. His initial resentment toward vigilantes seemed too sincere to be an act, and it seemed unlikely that he would've warmed up to vigilantism so quickly as to have immediately adopted an even more hardcore vigilante persona. And "Chase" and Vigilante often seemed to be working toward conflicting goals, which made me wonder if maybe there was a split personality involved. I expected "Chase" and Vigilante to be the same person because it's what we were supposed to think, but it never quite felt right to me. And that's because they were never meant to be the same person.
