No you take the guy who you think can be the future... Not the leftovers. If they have a guy pegged do all you can to get him, in the NFL you dont get many shots at this.
Nah no coaching staff holds out long enough, lose a couple game and suddenly "The rookie is magically ready" He will play the same week one and week six. Put him in there and let him learn, it cant ruin him it will just show you if he has it or not.
You either can play QB at the NFL level or you can't. When you were younger they did not have as many recourses as they do now for development for these kids. Don't worry the rookie will start and need to start. No sense letting him sit when the only way to learn fully is to actually play.