User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-5339542-20120730161617/@comment-34954086-20120730163446

I think it's possible but where he ends up depends on how the work the Matrix, which components they use, if they have a fixed singular Firestorm Form or have it change depedning on who the primary componenet is. For example With Ronnie +Stein with Stein as a voiceover and a younger firestorm build could fit with the team, and more classic firestorm outfit with Stein as the primary and Ronnie as voiceover could work on the league. Jason+Ronnie would probably be better suited to the team assuming they're both kept at the teen age.

Firestorm is tricky...