There was little contention entering April’s draft that whatever team landed Troy’s Leodis McKelvin would not only be gaining the services of one of the top cover corners in the rookie class, but also a player who would add some sizzle returning kickoffs and punts. Although more accomplished as a punt returner, McKelvin was effective at both, scoring seven touchdowns on returns throughout his collegiate career. But the way we hear it, his special-teams ability will be shelved in Buffalo, at least early on. With an already brilliant special-teams unit — arguably the best in the NFL — and a shoddy secondary, coach **** Jauron wants McKelvin to learn the ropes of the defense first and foremost. McKelvin isn’t a particularly astute student of the game, and the feeling among the coaches is that throwing both the defensive and special-teams playbooks at him at once will stunt his development. Even if the team felt McKelvin could handle dual responsibilities, there’s no guarantee he’d improve the special-teams play, considering KR Terrence McGee and PR Roscoe Parrish are two of the best in the business.