Packers.com presents 'Prospect Primer,' a video look at an assortment of draft-eligible players who attended the scouting combine in Indianapolis. Michigan State's Dion Sims averaged a healthy 13.2 yards per catch and recorded a pair of 100-yard receiving games last year. Sims is considered a strong pass-catcher and in-line blocker, but concerns about that speed and ability to stretch defenses have him as a mid-round prospect.