Before the San Francisco 49ers played the Baltimore Ravens on December 25th, Brock Purdy was the MVP favorite due him being at the top of numerous statistics, including a superb completion percentage and a ridiculously high passer rating. After the Ravens game he played a game so bad he’s out of the MVP race.
Both are true.
This isn’t a discounting of one over the other. Brock Purdy played at a high level for almost an entire season at the top of nearly every stat made for the position. This wasn’t a one or two-game showpiece.