Are We There Yet? made clear that Dexter did not actually kill "brain surgeon" and he or she is still alive. The same time, Zach Hamilton turns out not to be a killer of those he was accused, on the contrary this young psychopath learned literally everything from Morgan and therefore followed the code. (I still can't get over his death)
Make Your Own Kind of Music is more relaxing episode, it does not suggest some important plot twists, but it explores many new things we might be guessing and did not believe. This episode takes look at three major points: Hannah & Dexter further relationship, "brain surgeon case"/Cassie's murder and Debra.
In Are We There Yet Dexter asked Hannah to stay to move forward together and she happily accepted the invitation. But this is never going to be easy, since Hannah is already chased by FBI. Dexter decides to take care of it himself, alongside many other problems he's to deal with. Dr. Vogel, as always, genuinely questions his ability to succeed anymore. He literally is starting to be human. As a fan of cold blood serial killer, I don't enjoy this much, but on the other hand, he seems more real now.