1. Yes
2. No
3. It depends. Keep in mind that projections are never a sure thing, and the further you are away from $20m in advanced scouting, the less sure they are. Makeup helps, but it's just one of many, many factors.
4. Development needs playing time. Sitting on a ML bench with ML coaches is generally not going to be as good as playing in minor league games with minor league coaches.
5. See my comments for #3. Projections are never a sure thing. There are many factors that can work for or against a player reaching his maximum potential.