At the end of the day, it's about who helped their team secure that 1st round bye in the playoffs that matters more than passer rating or TD's, but TD's is more important than passer rating -if- interceptions don't exceed TD's and that's not the case here.
but I think you misspoke. You said MVP is most valuable player on the team. In this case, don't you mean MVP of any player in the league to their team? Otherwise there would be 32 MVPs.
Don't get me wrong, Dak's making a huge case for himself and deserves credit