Dan Campbell's play calling on 4th down should teach him there are limits to going for it on 4th down, he is going to have to learn when to go and when not to go, his decisions cost this team dearly.
Here is a crazy stat from the game, when both QB's felt pressure, the Lions had -13 yards on 10 pressures, and the 49ers had 127 yards on 15 pressures. Purdy also played, statistically, almost a perfect 2nd half. Can Tua and Dak and Herbert step up when needed late in a big game? Purdy certainly did. Makes me think Purdy will be a good QB now for years to come.