User blog comment:BatmanFan2931/Men in the Iron mask/@comment-104.35.137.227-20160225033751/@comment-3423279-20160225034744

Except for one flaw in that theory, it is pretty good.

Now for the flaw, the Man in the Iron Mask was imprisoned before Jesse was, who was kidnapped by Zoom before the breaches that enabled him to get to E1 appeared.

Unless Zoom had another, less effective manner to get to other worlds beforehand, it couldn't be Hunter Zolomon's twin.

In the Flash Comics any speedster can travel forward and backwards in time with enough speed, but they can also go between universes, so Zoom might be fast enough to do that.