Keim mentioned it here
The Redskins view Terrell McClain as a nose tackle in base and a tackle in nickel. He’s not big -- he's listed at 302 pounds -- but he relies on quickness and footwork to penetrate. He hasn’t been the most consistent player, either, playing only one season of 16 games. But he can make plays, and the Redskins like how he moves sideline to sideline, a key when they’re in nickel vs. spread offenses. But he’s coming off his best year and was active. Is he worth $5 million a year? We’ll find out. He played two years in Houston when the Texans ran a 3-4, and one reason he signed with Dallas was because it played a 4-3. He often lined up over the center in the Cowboys’ front.
Washington Redskins re-shuffle line, still interested in Bennie Logan - Washington Redskins Blog- ESPN