You simply do not understand the meaning of high grading.
I believe we all understand it perfectly although I'm not sure that even you understand your personal version of it
While it is true that no one can tell the potential of a 1.5 buck, Dr. Kroll's research shows that a 1.5 spike takes 3 years to catch up with a 1.5 6 pt. So while we don't know the potential of the spike we do know that the 6 pt. has more potential to develop a large rack quicker than the spike. But, because the 6 pt. is harvested as a 1.5 it never comes close to reaching its potential and the spike may be legal as a 2.5 and not live long enough to demonstrate that it had the potential to become an 8 pt. This results in smaller average rack sizes for 2.5 buck due to ARs.
So you are, in effect, saying that
what you call high grading will occur with or without our present AR's, meaning that your prior claim that AR causes high grading is therefore false. Once again,You cant have it both ways.