There is also the factor that, in order to dream share, they are under a powerful sedative. I would say that their having accelerated brain functioning makes the dreams just that much more vivid, and realistic. And I know that, when I'm lucid, if my dream is too vivid, it seems all that much more like waking life (even when I know that it isn't), and it makes control really hard. It is like trying to control a B-6 enhanced dream. If this is the case, it makes all that much more sense that only one person on their team (the "outside of the box-thinking" Forger) is good enough at bending himself to a situation to be the only one capable of crazy control, like that.