The Raiders added many new linebackers during free agency this year. Derrick Johnson came over later in the off-season after Raiders signed Tahir Whitehead and Emmanuel Lamur. Take a look at this film study of Tahir Whitehead here. All three linebackers are slated to start in the middle of the defense this upcoming season.
Emmanuel Lamur is easily the most mysterious of the three free agent linebackers acquired by the Raiders this off-season. Lamur is familiar with the new Raiders scheme after starting for Guenther in his first year as defensive coordinator in 2014 with the Bengals.