When a guy has a top 5 performance but he's not a top 5 QB, I'm giving some credit to the guys around him.
And this sounds alot like Matthew Stafford. No playoff wins for his first 12 years in the league, no top 5 rankings in those 12 years, then he goes to a Rams team who were already built to win a Superbowl and then Stafford shines.
The year the Rams went to the Superbowl with Stafford, he led the league in interceptions.... interesting. So according to what you've perfectly stated, along with the evidence I've placed before you, all the credit has to go to all the guys around him in L.A., I assume.
To conclude, Dak has been top 10, every season he has completed healthy.
I'll leave you with this. ALL quarterbacks can only succeed because of the guys around him. Mahomes OR Brady have to credit the guys around them. So if that goes for the two greatest quarterbacks to have ever lived, then best believe that goes for every other quarterback who has ever played, currently playing, or will play in the future.
Quarterbacks don't win games, teams do.