Go watch S6-S8. The inner monologue has been fine, compared to what they did with it in those seasons. Although, it was never all that...measured. Even in the good seasons, the inner monologues can be a bit on the nose and corny.
Anyways, I'm thinking this goes one of two ways. Either Harrison kills the cop and Dexter kills him, or Harrison kills Dexter. I hope there's a third option I'm not seeing, because those two are a little too obvious. They wouldn't be bad, but just a bit predictable.
Good season overall. There are definitely some weaknesses, but it's still been so much better than the absolute joke the last three seasons were.