I think for something as broad as the NPA theory, we have to bear in mind two things: that it is near-impossible that all of it perfectly corresponds to what is true or correct; and that objective proof will only arise from future, perhaps distant scientific advancements. One day, by virtue of said genetic advancements, the NPA theory may (may!) be rightly considered an important and precocious step forward with swathes of it found to roughly correspond to what is considered valid. Something like that anyway.
So our frequent squabbles over how this or that person is this or that type are unimportant in the grander scheme. They do however keep the board lively, which is no bad thing in itself provided things remain civil.