you said they chuck junk! In my experience Rock Stars don't chuck junk. Their steps forwards and amount of drills will be less but it all still happens in the right order for it to be good quality. Chuckers are chuckers end of. They are not rock stars, they are chuckers!
100% don't agree... the chuckers that you speak of are created by bad coaching... not by the athletes. The chuckers that I speak of throw double layouts at age 10 or 11 and need help refining their talent.