Never a safe assumption to say the defense will be the same in two years.
theyll still have bailey, wilson, gold (hopefully), dj williams, darrent williams, foxworth...and they get new d-linemen every year.
The D is pretty set with young guys and veterans, and the veterans have long term deals.
only question will be how long john lynch can keep kicking ass and what they do about nick furguson now that hes out for the year.