if you're looking for reasons why they are winning there are several IMO. The defense struggled through some injuries that caused them to use a lot more zone coverages. They are healthier and use more press and man as they did last year. Time for the Henne followers to realize how much better Matt Moore is then your boy. He limits his mistakes and scores in the red zone. It's quite obvious the offense not only functions better with Moore but is more confident. Moores play has also taken a lot of pressure off the run game. The schedule is also a factor but not as significantly as some make it out to be. The Dolphins are not just beating bad or injured teams, they are pummeling them.
Toughest game left is the Pats which will provide an assessment of where exactly this team is. I am surprised I am saying this but that may be the only game left that they lose.