If you lose the special ability, then I would REALLY suggest making it imposible to recruit from different SF RCs. Perhaps allowing if they have the same ability, but I think that would require exposing the secret of their ability. Or at the very least labling them somehow: SFa, SFb, SFc. With "a", "b", "c" not standing for anything other than as a way of distinguishing between the types of skills.
