Has anyone theorized that Earth 2 might be the Earth from the 90's Flash TV show? I paused the final scene from the last episode and noticed the villains from Earth 2 looked like rejects from the 90's TV show. Also the architectural stylings from Earth 2 match the Art Deco style from the old show.
I think the man in the iron mask on Earth 2 is the Flash from the 90's show. Remember Barry saw the 90's Flash when he travelled to Earth 2? When Zolomon became Zoom on Earth 2 he must have "taken care" of the original Flash who would probably be his first nemesis. Whether he was still active or retired is still to be determined. Then he assumed the identity of "the Flash" as Zolomon said "to give people hope". We also haven't seen Henry Allen's Earth 2 doppleganger! When the man in the iron mask was tapping JAY he was warning Barry that Zoom was Jay Garrick, and he hasn't figured the Zoom is actually Hunter Zolomon.
But I digress, I'm just now have this massive expectaion of seeing John Wesley Shipp donning the 90's Flash costume along with Kid Flash and Jessie Quick!