The identity of red x (teen titans)

Jason Todd, Grant Wilson, or a bionic monkey? I don't think so. I think I've figured out the identity of the second red x in the teen titans series.

For those of you who need a refresher, (as teen titans hasn't aired on cartoon network for a long time) red x was a grim reaper looking thief that started as an alter-ego for robin. Robin pretended to be a villain to get close to Slade. To really sell it to Slade, Robin didn't tell the titans and even fought against them using advanced tech designed to fight them all. Eventually, Slade discovered who Red x's identity and Robin abandoned the suit. Because the suit was powered by an unstable formula, he has to lock it away in a safe vault in titan's tower. (it was too dangerous to dispose of the normal way.)

An un-determined time later, the titans stop a robbery in progress and finds the thief to be Redx. Robin was no longer in the suit and the new guy was never unmasked leaving it the second most aggravating unsolved mystery in the series (After if Terra was alive or not.)

So this forum will be dedicated to discovering the identity of this guy. Let the theories begin.