Good eye, Coach!
Pay attention to pics of the football coming off of Dak's hand this season. Zoom in. Watch how Dak's fingers look rigid, and his finger tips are slightly bent inward. All signs of higher increased arm/hand strength being exerted when throwing and releasing the pass. That's probably why a lot of his throws are ending out high or trecking at an upwards projection. He's even thrown some wobblers. All signs of rigidness in his throwing arm, plus increased hand grip on the football during release.
This can be fixed with a much lighter weights workout where he can better define his arms but not get so bulked. It very likely is the cause of some of his bad throws. Half the time he gets away with an accurate and well placed throw. Other times those throws sail on him or get thrown inaccurately.