DAVIE, Fla. -

The middle of the Miami Dolphins defense is getting a lot of attention in training camp.

While all three projected starters are the same as last year -- Dannell Ellerbe, Koa Misi and Philip Wheeler --  they are each lining up at different positions. Misi, who was the strong side linebacker, has moved into the middle where Ellerbe was before. Ellerbe has moved to the weak side. Wheeler is in Misi's old spot.

There also is a new linebackers coach: Mark Duffner, who came over from the Jacksonville Jaguars. He has ramped up the energy level in the group.

Rookie fifth-round draft pick Jordan Tripp has caught on fast. He got some extra work with the first unit during Thursday's practice at both inside and outside positions, and in the nickel package.