https://theathletic.com/5161135/2023/12/27/nfl-week-16-results-scores-coaching-decisions/?source=dailyemail&campaign=601983
Ravens defensive coordinator Mike Macdonald didn't have their linebackers mug as much as they usually do and brought pressure from the edges. The Ravens didn't want to make it easy for the 49ers to gash them in the middle of the field with hot throws. On the third play of the game, they had linebacker Roquan Smith mug the line and blitz and they got burned for a 58-yard pass to George Kittle. After that play, MacDonald seemed to adjust and went away from their usual style of play.
Stephens described Purdy as a "spot thrower" and said that they just needed to be in the spots that he likes to throw to based on film. I believe he means that Purdy is an anticipation thrower and he's going to throw with anticipation into windows that he believes will open based on the coverage. Though Macdonald deserves a lot of credit for his play calling, he had the Ravens prepared to capitalize on Purdy's tendencies.