I found a super-old video of Michigan State head coach Nick Saban at a coaching clinic, breaking down his 4-3 zone defenses. 1 hour long but hugely informative if you're a strategy wonk, and even a casual 5 minute viewing at some random timestamp will have you coming away with some great insights.
This has a relevance for the Cowboys because
-we play almost all the zone concepts that Saban discusses here.
-Saban, like Marinelli, is VERY focused on giving players simple and easy-to-digest assignments for every play. They've got the same mentality - think less, play fast. Richard did the same sort of thing in Seattle.
-Saban discusses the importance of playing man and forcing receivers off of routes, even in what would nominally be zone looks (he calls it pattern matching). "If you're going to sit back off the receiver and watch the quarterback's eyes, all you're going to see is him completing a pass." We've all been sick of seeing that since ~2012, and this is the year that that's all supposed to change.
So think of this as kind of a primer on the Cowboys 2018 defensive strategy.