Who’s the man in the iron mask?

IronMask

My daughter and I have been having a great time watching The Flash on TV since it debuted last season. And while I’m as confused as anyone by the last episode before the show’s current hiatus, the identity of the Man in the Iron Mask seems pretty clear to me.

Think about it; why would Zoom (this season’s bad guy), who captures speedsters to steal their speed, be holding a guy in a cell with an iron mask on his head, whereas his other prisoners didn’t have or need such a mask?

Let’s see… is there a really fast character from Earth-2, who Zoom for some reason wouldn’t want to be able to speak? And one who, for some reason (say, being a WWII newsreel photographer?), would know the tapping code that POWs used to communicate with each other?

Seems pretty clear to me that, all you have to do to discover the guy’s identity, is solve this simple mathematical formula: “3X2(9YZ)4A”.

(Either that, or he’s Captain Marvel (with the speed of Mercury), and Zoom doesn’t want him to say SHAZAM! Or he’s the Wally West of Earth-2. Or the Jay Garrick of Earth-3, or…)