Crowell is a great athlete who is rapidly improving and is an every-down player who can cover a lot of ground in coverage or in pursuit of the ball carrier. He had his best season as a pro last year and is more productive than many realize. Mitchell is coming off a Super Bowl victory and is at his best coming forward. He will help add size to the Bills' front and should be an able blitzer and reliable player versus the run... Posluszny and Mitchell can play inside or out, and adding these two to last year's mix should make for a big improvement on the second level.