Let me agree for the moment Dak is a good enough bus driver to win a SB.
The question then is can a team with a bus driver quarterback win the SB?
Looking back over the, say, 20 years, how many teams won a SB with a "bus driver" quarterback?
We see 7 won by Brady, 2 by Mahomes, 2 by P. Manning, 2 by E. Manning and 2 by Roethlisberger. 1 each by Rodgers, Brees, Stafford and Wilson.
Were/are any of the above "bus drivers". You could make a case for E. Manning I guess, and maybe even P. Manning in "his" second SB win, he was terrible during the season and the playoffs, his defense carried the team to the title. Flacco is undoubtedly a bus driver overall, but the SB winning season he was not. Just check his stats for that playoff run. But that still leaves 16 of the 20 won by not bus driver quarterbacks.
If "bus driver Dak" is to win a SB, I'm sorry, it will have to be with a top defense, Dak playing consistently very well (which has seldom done) and a lot of luck, as well as limited key injuries (such as Tyron playing-14-17 games). Which as an aside means no Hopkins, the Cowboys need to beef up the defense and the offensive line as much as possible.
Anyway, that's how I see it....