Just to be clear, I don't think for a moment that Rush is better than Dak is. But I don't think Dak is living up to his potential. Maybe he needs to run a simplified offense for a while, just to slow the game down for himself and build his confidence back up. When I say "simplified", I mean like the one currently being employed for Rush. Maybe throw in some designed runs here and there.
I agree with everything you said, 100%!!! Sometimes less is more!!!
Look at certain defenses.... you'll have defensive coordinators coming in to teams boasting about having a 200 page playbook. That same defense would come out and have missed assignments, blown coverages, but hey.... it looks cool when you have defensive players moving around pre-snap!!! But the defense is trash because they have too many switch off calls, pre snap changes, etc....
Then you have a defensive coordinator come in to that same team and SIMPLIFY the playbook and design it around the strength of the talent thats on the team. The playbook may only have 10 pages, but the defense is effective!!