I looked up Jacob Norman on the Baylor website. If this is the same fellow (100 meter specialist), he did not really improve from his junior year of highschool to his last year of college.
11th grade - 10.37 (Texas state champ 100 meters)
Senior Year, 2008 - 10.29
NCAA’s 2008 - hamstring cramp in qualifying round
http://www.baylorbears.com/sports/c-track/mtt/norman_jacob00.html
So it appears whatever system Mr. Norman used did not result in steady improvement past the age of 18. But I should stress there is a lot we don’t know.