Kelvin Sheppard is practicing as the Bills' starting middle linebacker at OTAs. The Bills have identified last year's third-rounder as a "nucleus" player on defense, after Sheppard racked up 61 tackles in the final nine games. He's quite likely to be an every-down player and impact IDP contributor. The Bills' starting weak-side backer is Nick Barnett, with Kirk Morrison currently at SAM.