Let's take a look at a two year old. The innate qualities are there since they are hereditary. But they are not yet developed to the degree that they can be recognized. Foot speed, height, arm strength for throwing, eye hand coordination, etc. The learned skills at this age are nonexistant.
As adolescence comes along, a clearer picture develops as to what the final product will be. This is generally around age 16 years.
A kid who is age 12 throwing 75mph strikes and who stands 5'7" tall may be about through. He may be well into adolescence, end up at 5'9", and have an 80mph fastball.
On the other side of the coin there is the same aged kid who weighs 80#, is 5'6" tall, throws 62mph, and has not yet entered adolescence. He could well end up at 6'4" with a 92 mph fastball and run like a deer. Or not. It is too soon to say.
Innate baseball atttributes are inborn. They are almost impopssible to project into adulthood before about age 16. Learned skills are just that. But how refined they will ultimately become depends on the limitations of his innate ability.
Think about a person with an IQ of 140. He was born with that. He can be taught to use the ability. No matter how hard a kid with an IQ of 100 tries, no matter how much tutoring, he will never reach the level of academic achievement level possible for the first kid.
Certain things are inborn and other things are learned. A 5'4" full grown basketball player aspiring to play in the NBA is snookered by his genetics. Such is life.