Your commander can't come out and play right now because he's grounded

from here

I'm not sure how the group members could miss the fact that their leader was only 13. It's not like he was hiding in a corner where no one would notice him, he was their leader so they would have been hanging off his every word. How can a 13 year old pretend to be an adult that convincingly? Were they relying on him for the bomb-making expertise? Did it amount to putting dry ice in a water bottle? They may have been planning to plant bombs but I have serious doubts about their competence as real threats to society if they can't tell that their own leader is a child.