Maybe the group does end up being imprisioned in The Silence- long enough for them to eventually lose hope in escaping. But, then there's a group of trusted workers at The Silence (who are secretly helping inhumans escape) that takes them to a hidden island, which they can't leave so that they don't get captured again. From there, the inhumans can be taught basic fighting skills, along with improving their powers, and are used as an army to defeat Mr. Firestein and destroy The Silence.
Just a stupid idea...