Whoa now. I don't know about that. Kap and RGIII both have looked great. They don't look great now not because of their talent i'd credit it to how their organizations handled their careers but they have played some big time football in this league.
They weren't reading the defense and scanning the whole field like Romo, Brady, Brees, etc. do.
They both have struggled mightily since the NFL figured out how to slow down the read option stuff and make the QB's sit in the pocket and decipher the coverage.
Kap was struggling when Harbaugh was still there and they still had talent. After 2012 it has been a slow downward spiral for Kap. And as for Griff... he crashed and burned immediately following 2012.
Again, they led their teams to wins but they had preset targets and the catch 22 that the read option initially put defenses in played a really big role in opening up huge windows to throw in. Once Defenses figured that problem out and those two had to start playing real NFL QB style... they've sucked.
Prescott is doing everything that an NFL QB needs to do from reading defenses to throwing in tight windows.
Those two guys never played QB the way Dak has in his first two PS games.