Sure the Dolphins were favored against almost all the teams during this 7 game win streak. Let's estimate that the vegas spread on gameday was +3 Miami -- I'm too lazy to actually check but this seems pretty reasonable. This translates to a 60% win probability for the favorite. To do this 7 games in a row is .6 ^ 7 == 2.7% chance. Remember this is the market talking, so it factors in all the injuries/caveats we know about.
To outperform the market like this, they have done something pretty incredible already.
To outperform the market like this, they have done something pretty incredible already.