Percentage of Footballers Playing Out of Position?

First an assumption. Let's assume there is one and only one position that is a best fit for any particular player. That they wouldn't be equally good at say running back and linebacker.
What percentage of high school kids are out of best-fit position?
What percentage of college players?
Pros?
It's clear to me that the high school percentage has to be much higher.
What percentage of high school kids are out of best-fit position?
What percentage of college players?
Pros?
It's clear to me that the high school percentage has to be much higher.