The Miami Dolphins need a dynamic, explosive, play-making linebacker who can handle coverage and also chase from sideline-to-sideline and finish with authority. The Dolphins need a youngster like Roquan Smith, the linebacker from Georgia. “My relentless pursuit,” Smith said Saturday at the NFL Scouting Combine. “I believe in that. I was always taught, if you start something, finish. And take advantage of every opportunity. And tomorrow is not promised. If it’s my last play that I ever play, how do I want to go out? So I feel like every play, I treat like it’s my last play. And I bust my tail like I don’t have a next play.” Smith was dominant in the College Football Playoff. But he was really dominant in the SEC all season. “I feel like I can make a tremendous impact on the defense, just with my play-making ability, my leadership qualities,” Smith said. “And everything that I possess, as a football player on and off the field. I feel like that will definitely elevate any defense.” The Dolphins are planning to cut veteran linebacker Lawrence Timmons. Pairing a player with Smith’s talents with sophomore Raekwon McMillan and veteran Kiko Alonso could change the complexion of Miami’s defense. Roquan and Raekwon sounds about right. They’re both young. And they both have excellent instincts.