I'm with Mackey on this. 2-3 years ago guys were shutting down the Cowboys' passing attack by bracketing Dez, so Beasley and Witten feasted. Williams has always been Williams. He is very average even as a #2 receiver. Last year (and part of the year before) guys were shutting down our offense by bracketing Beasley after it became clear Dez lost a step. His days of requiring a safety over the top and blanket coverage are over.
I've been pretty adamant for 2 years now that Dez need not be a focal point of the offense, for a mixture of reasons. Some of them on him, some of them on Dak, and some of them are just chemistry issues, but it's been apparent to me for 2 years that "get Dez into a rhythm, at any cost" was not a good offensive strategy. It caused forced passes from Dak to a receiver that sometimes wasn't open, sometimes wouldn't catch, or forced him into a throw that isn't his strong suit (Romo could float a jump ball to Dez, Dak isn't nearly as adept at that). Our offense was much more fluid relying on the ground game and then spreading the ball around to Beasley/Witten/Dez/Williams/whoever. But it was set up by the run game 1st, and the ability of everyone on the team to play to their strengths was sustainable. That's when our offense has been good.