Jackson, Purdy and McCaffrey have a lot to prove on Sunday; who is MVP worthy? The five finalists have been announced for the NFL’s Most Valuable Player Award. Three of them are playing in conference championship games on Sunday. Lamar Jackson will lead the Baltimore Ravens against the Kansas City Chiefs in the AFC Championship game, while Brock Purdy and Christian McCaffrey and their San Francisco teammates play host to the Detroit Lions in the NFC Championship Game. Jackson had a superstar year for the Ravens, who are the number one seed in the AFC and who finished with a 13-4 record.…