User blog comment:Eobard95/Is Vigilante the real Adrian Chase - Still portrayed by Josh Segarra?/@comment-24152851-20170712110258/@comment-24152851-20170712122054

But that would mean Simon and Adrian were raised separately, and Simon might not even know Adrian. I just don't really see the point of a twin impersonation if the twin being impersonated has no significance. It's not like Adrian Chase was already an important person to Oliver, Simon literally interjected into his life with the Adrian Chase guise.

If the real Adrian Chase was training to be a lawyer, than that means Simon was faking. But his lawyer skills are through the roof, even superior to Laurel's lawyering. Simon had to have been to law school himself.

That last part is the thing that always bothered me about the "Vigilante is the real Adrian Chase" theory. When Prometheus and Vigilante met, neither acted like they knew the other. There's also the fact that Simon reported Vigilante to the cops, which means if they caught him they'd see they were twins, which would raise a lot of suspicions.