I'm really not sure how the coaching staff can justify this game. It's almost like the team just expects execution to get the job done regardless of talent. No need to get the ball into the hands of the elite skill players.
If you can't throw it up to a $70M WR when he has single coverage then it would see that:
A) You've misevaluated that player and he's nowhere near as good as you've paid him to be, or;
B) You don't know what the hell you're doing.
Those are the only two possibilities, IMO. If you can't at least give your playmakers a chance you either don't have playmakers or you don't know how to use them. When it's single coverage, there is no other excuse.
During the times when Dez was rarely thrown to over the years, people would hang their hat on how defensive coordinators were scheming to take him out of the game. IMO, this was always a half-empty excuse because that's like the textbook definition of a DC's job and conversely, it's the OC's job to find ways to either exploit such efforts by making teams pay for overcommitting to one area or to beat such efforts through their own scheming and adjustments. Now, we don't even have teams double teaming Dez every down and Dallas still can't even make an effort.