If the Saints do decide to go in this direction with the two DC's with separate responsibilities it will simply be an extension of the trend in the NFL for decades. In the distant past NFL coaching staffs were very limited with coordinators having just a few of assistants apiece in some cases. Fast forward to the current day and not only do you have O-line coaches, LB coaches, and secondary coaches, but you now have interior and exterior defensive line coaches, inside and outside LB coaches, CB coaches, and safety coaches and each of those can have their own assistants. Then you have defensive quality control coaches as yet another level.

Having a run game defensive coordinator and a pass game defensive coordinator seems like a logical extension of the trend ... if that is indeed the plan.