No, I’m not saying Dak is as good a player as those guys, I’m using those guys as evidence that the record, including playoff record, the first few years of a career does not define or condemn a player’s career the way you are pretending it does with Dak.
You can’t reasonably say your argument on record and playoffs applies to Dak but somehow doesn’t apply to others.
Manning had a RB and a WR that made the HOF, and Brees had a HOF RB and TE, and they both had great running games to help take pressure off them, so let’s not pretend they had no talent around them.