LAST SEASON: A 7-9 record with rookie quarterback Ryan Tannehill doesn’t sound so bad, until you realize the 2012 Dolphins could have been significantly more competitive with just a little bit more offense. That’s why Miami pounced on free agent WR Mike Wallace, a big-play threat who stretched defenses in Pittsburgh with his blazing speed. If the Dolphins are serious about ending New England’s stranglehold atop the AFC East, they’ll have to end a six-game losing streak to the Patriots. DEPARTURES: LT Jake Long, RB Reggie Bush, LB Karlos Dansby, TE Anthony Fasano. ADDITIONS: WR Mike Wallace, CB Brent Grimes, LB Dannell Ellerbe. OUTLOOK: Tannehill threw only 12 touchdown passes last year, and the presence of Wallace on the flank should open things up for Brian Hartline, who posted 1,083 receiving yards in 2012. A season-ending knee injury to new TE Dustin Keller doesn’t help, and unproven RB Lamar Miller replaces Bush in the backfield. Defensively, the Dolphins are hoping rookie Dion Jordan can complement fellow DE Cameron Wake, one of the league’s premier pass rushers.