The selection of quarterback Fernando Mendoza was a simple one. Once the Las Vegas Raiders decided to hold on to the pick and not trade it away, Mendoza was the easy call . The real work was done over the course of the final six rounds as general manager John Spytek added nine additional players. He found depth options along both lines of scrimmage, including a potential contributor at defensive tackle in the new 3-4 scheme by taking N.C. State’s Brandon Cleveland in the seventh round. They found speed on offense and a whole lot of bodies in the defensive backfield that could be big factors early in their careers. Oh, and the potential steal in the draft in cornerback Jermod McCoy. Grade: A- The Raiders weren’t really trying to hit a grand slam, and they didn’t. Spytek’s approach has been more about finding players with great character and identifiable athletic traits to try to build his roster. The Mendoza pick was responsible and prudent. It was also easy.…