Darnold was in his eighth NFL season and the Seattle Seahawks are the fifth team of his professional career, but the point is the same with second-year breakout candidates. 41 overall selection will emerge as an every-game starter this season, after recording just 16 tackles and starting two games as a rookie. He only started three games for the Dolphins as a rookie and yet still finished seventh on the team with 55 tackles. AFC SOUTHGiven that Marks led the Texans with 703 rushing yards as a rookie, some would argue that his breakout has already occurred. Should L.A. morph into the uptempo aerial assault McDaniel excelled with (at times) as head coach in Miami, second-year wideout Tre Harris could pop for exponential gains over his rookie season.