Unless the last 6 games or so have been a fluke, Dak is the real deal. Kellen Moore was holding Dak back and McCarthy has unlocked him. Dak obviously deserves a ton of credit for putting the work in too.
At this point, its all about trying to get Dak's cap hit low enough that the team can be competitive. If Dak continues to play like this, we have to hope Dak gives the Cowboys a cap friendly deal.
His detractors are going to hate this but something like 8 years $440m with a good bit guaranteed and backloaded. Good thing that Jerry can afford it because it would look like a $200m signing bonus. You could keep his cap hit in the $35m range for a few years doing that.