Henry Hewitt was the preferred choice to be the new Firestorm, a similar match to Jax but Caitlin chose him because he's a scientist (and she decided to get a little bit elitist for part of this episode. Obviously, then, since he was first, it wasn't going to work out as intended. While he didn't successfully converge with Professor Stein, his powers were awakened due to the tests at STAR Labs, and naturally he decided to take the pain of rejection and his new abilities to become a supervillain. While he was ultimately defeated thanks to the Flash and Firestorm 2.0, those powers may still be within his system, and they didn't kill him off (maybe that means The Flash's 'killing spree' is over), so is there potential for Hewitt to return later down the line?