First of all, Mahomes has been to two SBs and 1 WCF game is first three years starting and it should have been 3 SBs, but Brady had the ball last. The year they won the SB he brought his team back in every game up to the SB when down at half-time by a large margin. Mahomes did this without a top flight RG to rely on and take pressure off him.
Second, Dak has done nothing with the best OL and RG in the league and a WRs core that is now essentially the best in the league. He’s done nothing but flounder around four years wasting talented roster after talented roster, while training him, a guy who in year 3 took 1 week to throw a TD in trading camp.
Until he performs against real competition let alone in the SB in games of meaning, then it’s all hot air.
As far as progressions, guy is throwing to his first read every-time. Even this weeks highlights show it,