The thing stumping me about Carl is his low strength score (IIRC it was a 1.) Some people in this thread have pointed to different Robins, but I think any of them would likely have a 2 in strength. I cant think of any heroes who are suprt smart computer whizzes with a low strength (maybe Brainiac 5? Im not very familiar with the Legion). I could maybe see a young Lex having those stats though.
Of course the stats might just reflect a secret identity. Maybe Tim Drake or someone could be so undercover that they wouldnt show off their physical prowess. Or, if all the PCs are stuck in some kind of virtual reality or hallucination (as some of the DC Daily hosts guessed), then their initial stats wouldnt be totally representative of their real abilities anyway.