Reminds me of the story Charlie told about an Aussie rugby star (Tuqiri, I believe). Apparently they gave the players 6 weeks off at the end of the season and then had a conditioning test when they returned. Tuqiri, a specimen and from what I’ve heard, one of the more explosive players in the world failed the test and was sent home from the training camp on the spot.
The other issue that you will see is that these tests are often dominated by some of the LEAST explosive athletes on the team with the faster guys usually bringing up the rear.
A big problem with football coaches is that many still conduct 2 a days and training camps as if the players had been sedentary the entire off-season, as was typical a few decades ago. Nowadays with OTAs, minicamps, and lifting/conditioning starting in March, the volume and grind of camp is something one must survive rather than a stimulus that builds to a peak before the regular season and in my opinion is largely outdated.