It was underwhelming to tie a bow onto everything, but Quinn knows that Dexter faked the test result for him so that's got to go somewhere. And if you really want to kick a future season into high gear, have Deb find out in the FIRST EPISODE. There's your arc.
This is what I'm thinking they're going to do . Sure it would have been nice to have that revelation in this episode, so we're left wondering what will happen. Temis is right though, the writers need to grow a pair and turn Dexter's world upside down from here on out.
My only complaint for this season was that he got over Rita's death pretty quickly, although for somebody somewhat void of emotions I guess it works. I wonder how they'll solve Liddy's murder.