You know, as much as I hate to admit it, CJ does make some valid points when she bitches out Saul. It's not exactly going to be a cakewalk to rescue Lizzy, and Saul has proven in the past that he isn't the best at thinking clearly when it comes to planning ahead. It's also true that him going puts everyone at Dunbar at risk; if the Mallers catch him, they would have no qualms about torturing him to find out where he came from. Sure, CJ could help with the planning, but from her perspective, why should she? Putting everyone at risk for just one woman (no matter how much Saul may love her) just doesn't make sense. Will Saul go anyway? Yep. Will CJ help him? Probably. Is it the right thing to do? Not necessarily.