Calais is the reason we've been rock solid against the run for the past 5-6 years. He plays all 3 defensive line positions in the 3-4 and is a great under tackle when we put 4 down linemen on the field. He frees up others by causing disruption or taking on the double-team. Guys like him don't get gaudy sack and tackle numbers, but guys like him help keep opposing rushers down and keep teams out of the endzone.
If we lose Calais, Golden & Jones will be double-teamed and our ILBs will be further exposed. He's the entire catalyst to our defense, and if we lose him, it's bad.