The only change I see is at the QB spot. Dak--as much as I love him and think he's a stud--is more cautious and less accurate than Romo. His deep ball is more sporadic--he's missed Dez on deep balls that would have connected, coming from Tony. Dak's fade isn't all that great--and the fade route is a major strength of Dez's (and Tony's). Put more simply, the quality of target has dropped.
It's all about the shorter throws.
On Dez's targets beyond 15 yards, Dak has about the same numbers that Romo had in his last two full seasons. You can see that it's not just a Dak issue, as both QB had considerably more success with other receivers than with Bryant on deeper throws. Especially Prescott, whose passer rating on 15+yard throws
leads the NFL by a wide margin since he entered the league.
15+ yard targets
(2016-17) Prescott to...
Bryant 19 of 51 (37%) 515 yd 5 td 1 int 99.7
others 35 of 60 (58%) 928 yd 9 td 0 int 142.3
(2013-14) Romo to...
Bryant 30 of 75 (40%) 982 yd 7 td 3 int 101.9
others 52 of 108 (48%) 1415 yd 14 td 2 int 126.1
The reason Dak-to-Dez isn't nearly as good as Romo-to-Dez used to be is that Dak and Dez have problems connecting on the
shorter routes. Note that the passer rating to other receivers is identical.
target less than 15 yards
(2016-17) Prescott to...
Bryant 68 of 115 (59%) 740 yd 9 td 3 int 93.4
others 341 of 466 (73%) 3,194 yd 17 td 5 int 99.3
target less than 15 yards
(2013-14) Romo to...
Bryant 149 of 204 (73%) 1,524 yd 20 td 3 int 120.6
others 451 of 628 (72%) 4,185 yd 28 td 8 int 99.3