I think Dez' lack of production is simply due to Dak's immaturity as a pro QB. Don't get me wrong, I'm a big Dak proponent, but it's a fact he is a rookie and has growing to due. Dak hasn't yet gotten to the point where he can quickly run through his progressions. Unless it's a play designed to go Dez' way, it's obvious to me Dak's first reads are Witten and Beasley. Opponents have become aware and game plan accordingly and is why we're seeing Cole's productivity drop the past few games. By the time Dak progresses to Dez, he's held the ball too long and the play breaks down.
I don't think there's a problem with Dez, I believe he will return to past form as his QB continues to mature.
I don't think it has anything to do with the immaturity of Dak. I think it has to do with the inconsistency of Dez. Dak has been going through his progressions, which is why Beasley's numbers have increased this year. And when Dez was out of the lineup earlier this season, Dak was used to getting the ball to Beasley because he was open. Dez comes back, and there's a pressure to get the ball to your playmaker(s) - even forcing the ball. We saw what forcing the ball did to us in the Giants game.
If Dez is open, he will likely get the ball. The problem is two-fold:
1. Dez has to run
EVERY route to gain separation.
2. Dez is often covered with a corner and safety, and Dak is not going to force a throw into such coverage if he doesn't have to.
Furthermore, I think Broaddus pointed this out - the Cowboys don't want Dak throwing the ball deep all the time. Dez is good for jump balls - either deep or in the red zone. But those passes have a higher percentage of being incomplete.
I don't think it's wise to start focusing on Dez at the expense of our other receivers. Dez is often double and triple teamed, and it makes no sense to throw him the ball just to satisfy his need for touches.
Dak will get him the ball when coverage and situations dictate like he did against Tampa, a game in which Dez had 8 catches for 82 yards.
Dak is properly managing the game. Let him grow from there. Let's not try to get him in a situation where he's forcing passes to Dez because fans want him (Dez) to be more involved.