This isnt a Rush vs Dak thing at all. Dak is 1000% a better overall QB than Rush. What I'm saying is that it didn't effect the win column. I even look at the super bowl teams from last year. Did either team make it there because of the QB play? Not really. Not saying that either QB played bad last year as that would be false, but both of those teams rode their defenses to the big game, and most super bowl teams do. Had Brock Purdy been drafted to Cleveland he may not even be in the league at this point. Put him on a super bowl caliber SF team and hes an MVP candidate. Nick Foles didnt win a super bowl because he was a great QB....he just had a loaded roster. Stafford could barely make the playoffs in Detroit....wins a super bowl with a team that went all in in LA. I really don't care what people think about Eli Manning, the guy won two super bowls mostly because of an elite DL. Baker Mayfield couldn't stay on a roster a couple years ago, now hes made back to back playoff appearances now that he has latched on to a decent organization. Similar situation with Darnold. Goff wasn't viewed as anything special when he was traded to Detroit, but now that they've built that roster up he puts up top QB numbers again.
I get it offense sells so the league pumps those guys up year after year, but there is a significant correlation between winning at this level and not giving up more than 20 points in a game. QBs typically sell the most tickets and merch so they get the glory, but a heavy chunk of their success is dependent upon the other 10 guys on the field.