This type of thing happens all the time. Even in the pros. Hard to sit down a QB that won 11 games in his first year as a starter and clearly has a ton of talent. The coaches are not fortune tellers, they had no idea if Murphy could come in and lead this team in a real SEC game. They knew JD could. They are not going to take that risk just because the fans are upset about the offense. Can you imagine if they would have sat JD and then Murphy comes in and throws 3 picks because of his lack of experience? Then what? You have a starting QB with no confidence looking over his shoulder. Easy to say now that Murphy should have started from day 1 but no coach in the country would have taken that chance.