That's the whole point. It does not factor in the ability to play football, stay out of trouble, measure work ethic, heart, injuries, blocking, catching, etc. It is strictly physical measurements.
And the OP and original article showed exactly where AJ Jenkins ended up, he graded out the same as Alshon Jeffrey in the 2012 draft. Jeffrey went on to a good career and AJ Jenkins didn't know how to play football.