To play Tony, you'd have to be pretty dang sure Dak was not going to figure out what the defense is doing in time, and that Tony actually knows what to do in his place. And then you only do it late in the game when you're down to the last position or two. And then you only do it if you're pretty sure Tony can win it. Then the next week, you go back to Dak, no matter what.
It's really unlikely we're in that situation. Dak's so good at slowing a game down and taking advantage of the opportunities that are there. I don't think we're two scores back on anybody in the 4th quarter, and if we are, it's probably because the wheels fell off at more than just the QB position.