I was thinking about this since the last time we really spoke about Icon on Comicvine. I was thinking maybe Icon could be a Kryptonian who left Krypton decades ago. Feeling he had nothing to contribute to the society there, looking to help less developed societies rise up like Krypton's (Sorta like the ending to the Batman/Superman elseworld series)
Flash forward to a planet that wasn't really prepared for a technological leap like that, they rip each other a part and Icon retires to Earth in hidden shame. He can't go to Krypton, not with his work being such a catastrophic failure. Staying on Earth he keeps to himself and helps out anonymously whenever he can until the age of heroes is ushered in by the trinity.
He acts like a pressure valve for Superman's need to do good. Why doesn't Superman share Kryptonian technology with humanity? Icon's story reminds him what happens when you push a people too far, too soon,even with the best of intentions. While Superman is very proactive and socially engaged(as seen Action Comics). Icon could be more reactive and conservative, using his power when there's an absolute need.
And then we'd actually get to see a Black Kryptonian(I'm just sayin')