There always has to be a starting point for any quarterback. They will always begin their career as an inexperienced player, because there’s simply no other way to do it. You have to play to get experience. Yet your lack of experience also makes it harder for you to get experience.
The discussion recalls the rookie season of Pittsburgh Steelers quarterback Ben Roethlisberger, who was supposed to begin his career as the number three quarterback, yet by the third game of his rookie season, he moved into the starting lineup and never left.