In a strange way, we may be saying the same thing. I agree Dak is what he is at this point in his career but with the right weapons, he can win the big games. As stated before, my issue with him is the post-season 49ers game vs the Bucs, two completely different players. He had the same team except for one player........Tony Pollard. I hate to say it but when TP went down, Dak folded light a wet suit. We suddenly saw a player with little or no confidence in himself or more importantly, his teammates. He had trouble executing routine plays, making fundamental errors. What's crazy is the defense kept the game so close to where we didn't need him to be great, or as you mentioned, Elway or Marino. I don't think it's a coincidence that all we heard this off-season is the talk of prioritizing the running game.
Remember this started with whether or not he gets his extension regardless of how he plays this season and I will admit, 2/3 years ago it would have been a hard yes for me, but now everything about his future as a Cowboy starting QB is riding on this season. No, he doesn't have to win the SB or even advance, we can't see another post-season meltdown and this is from a pro-Dak fan from day one.