re: Why the lack of snaps for Harold Perkins?

Perkins needs to play the edge 100% of the time with a college scheme that let's him rush the passer like Lawrence Taylor / Von Miller. Pressure and disruption on the quarterback is way more valuable than any linebacker play (coverage or run support) that he could provide from off the line of scrimmage. For a running quarterback, I would say the spy position would count as quarterback disruption, so that is fine.