Nope, I have been saying this from year one with Dak. These stats look eerily familiar to these:
https://www.pro-football-reference.com/players/G/GrifRo01.htm
who came into the exact situation that Dak came into with a rookie RB dominating :
https://www.pro-football-reference.com/players/M/MorrAl00.htm
Dak's first year was the product of the NFL having to adjust from an inept offense the Cowboys had the year before to one with Zeke Elliot. Dak did not have to think, he just played with veterans helping him out on the sideline and half the field to read. You could tell from the beginning of the 2017 season that he was not capable of doing as much as he thought he was, and the more he thought, the worse he got.
I have no explanation however for his absolute loss of any semblance of pocket presence. That was one redeeming factor that Dak had in 2016 that he does just not possess.