Tannehill could have been healthy last year and they'd still only win like 7 games.
Their entire defense is garbage outside of the safeties and maybe the front 4 if Charles Harris can take a step forward this year. (hoping he does, he's a great guy off the field) Corners suck, linebackers suck, offensive line is still meh as it has been since like 2010, receivers are probably bottom 5 in the NFL, and the runningbacks are okay. Hardly enough to challenge for a wild card when you have the Chargers, Bengals, Ravens, Jaguars, Titans, and Texans all in the mix who are easily better than Miami.