“High school teams adjust next game; college teams next half; NFL teams next series”

Miami (FL) Herald sportswriter Armando Salguero, in January 2012, compared the high school football game to the faster college game to the even faster NFL game:
 
“There’s an old adage about how quickly football teams adjust, or should adjust, to the strategy of their opponents: High School teams adjust next game. College teams adjust next half. NFL teams adjust next series.”
 
The adage doesn’t seem to have many print citations, and its origin is unknown.
 
   
Miami (FL) Herald
Dolphins paranoia rears its paranoid head
Posted by Armando Salguero 01/04/2012 at 12:50 PM
There’s an old adage about how quickly football teams adjust, or should adjust, to the strategy of their opponents: High School teams adjust next game. College teams adjust next half. NFL teams adjust next series.
   
Miami (FL) Herald
SEPTEMBER 13, 2015
Armando Salguero: After struggles with Washington Redskins, let’s hope these aren’t same old Miami Dolphins
BY ARMANDO SALGUERO .(JavaScript must be enabled to view this email address)
(...)
The old adage is that high school teams adjust next game, college teams adjust next half, and NFL teams adjust next series. The Dolphins didn’t fix their issues on defense after one series. Or two. Or three.