No one is the ultimate arbitrar or authority on the subject. But Dr. has done his homework on the subject.I didn't know James White was the final authority on what was KJVP. I wonder what credentials he has to make himself the ultimate arbitrator of this subject.
He knows more than most. He has debated a number of KJVO'ers --some several times.
You have his book(as I do) and are aware that he knows his stuff. I'd say he is an excellent evaluator of the subject.