Who is the man under the Iron Mask? Well, I think it could be alot of people. Henry Allen, Jay Garrick, etc. But I think its Wally West.
I mean, think about it! Who remembers this version of Wally?
That metal looks just like this suit. Plus the picture above shows him to African-American hands. This has to be Wally. It couldn't be Joe. Joe is an extreme main character. And he died on Earth-2. But this is my Theory.