No. Anything is possible but I really doubt they are going to have him playing two different roles especially when they still haven't even revealed he is the Vigilante on screen.

"So they say homosexuality is a sin.So is sex before marriage, lying, cheating, stealing, lust, pride, murder, adultery, gluttony, greed, wrath etc. Oh but you forgot those parts when you were murdering us and going home to beep your sisters, cousins and mothers."

I am pretty sure he will have a bigger role, so far he has been useless to the story.
Or maybe he won't, you may never know

Not going to say no, but that would be a pretty neat plot twist.
I have my doubts, though, since they have very different motivations, and I don't know how he could be both and still manage to have a full-time job as an attorney.
"Never wrestle with a pig. You get filthy and besides, the pig likes it." Cyrus Ching

They usually use someone from stunts when a character is completely masked, which is the case for Prometheus. The situation for Adrian Chase/Vigilante is different as the intention was clear from the beginning and any google search could get the same result.
一瞬千撃

The stunt double would pretty much be the same height and weight as the "real" person behind Prometheus.
And it's not Susan Williams. The body type of Prometheus is clearly male. Second, she was with Oliver at the party where Curtis got attached by Prometheus.

Which episode was Chase and Prometheus standing next to each other?

There have been shots of both Vigilante and Prometheus standing straight up next to Oliver. We can gauge their heights that way.
I see another joker on the news telling me to play the fool.

While I agree on the "no way" part.. I love you guys that try to justify your theories with height or weight. Lmao
How can you tell that Prometheus is taller than Vigilante/Adrian Chase? They've never appeared on the screen together for one. There are also a plethora of camera techniques to make actors look taller or shorter on camera. They are also likely using a stunt double in the suits which would right there be of different height and weight
Regardless.

Oh well, probably just wishful thinking I suppose. I'm always wanting to be surprised or see the least likely person be revealed to be the villain. I'm still looking at Walter, Susan Williams or Chase.

No way.
Also, whoever Prometheus is, he's taller than Adrian Chase/The Vigilante.

Guggie hasn't ripped of Two-Face yet so maybe.
I see another joker on the news telling me to play the fool.