1. What is Carrie going to find in that room she was walking into when the last episode ended? Nazir would only have let her go if he knew it would not be a problem that she was going to come back and bring the cavalry with her. So whatever she finds in there, either she/CIA won't be able to do anything about, or they won't have time to do anything about.
2. Also, there's no way that Estes actually kills Saul to keep the old drone strike under wraps, right? Maybe he digs up some dirt on Saul (like not reporting Carrie's illegal surveilance of Brody in season 1) and convinces him to keep quiet, but I don't see him actually killing Saul.
3. Since killing the VP is obviously not Nazir's big goal (still 2 episodes left), what is? What does he still have? Roya Hammad is captured. The unnamed guy who shot up the Gettysburg store is captured. The explosives were captured (presumably). I would say Brody is going to be used by Nazir in some way, but that just happened and it's hard to see it happening again. Is one of the other characters in the show working for him and we just don't know about it yet?