This is like a high school or college classroom where no one asks any question...you know no one understands what is going on. What I would look for is juniors

This is like a high school or college classroom where no one asks any question...you know no one understands what is going on. What I would look for is juniors who can ask questions, take a morsel of feedback, run with it for a bit, and then ask another question. (But avoiding giving away solutions right away, since you want it to be a learning experience).