Hey, here's an idea. What if I introduced the big fighty enemy as a secondary element? Jade is probably the most powerful (or at least the most fight-savvy) character in the group. What if, when this enemy spreads to Earth, humanity ends up needing to turn to Jade for help defeating it? This would only happen towards the end of the Courtroom arc, and the EFC's failures could lead into their arc, much like the Android saga did with the Cell Saga.