For me its like trying to undersatnd a book by seeing a page or a chapter. The descriptions of LOG dont always fit. DS8 is great at math but ask him to write something and its very different. He can read at a high level, but chosses not to. I try not to dwell on the definitions anymore. I believe the Davidson's net is wide enough to capture most that may be missed by not seeing the whole book. No absolutes but maybe just the best fit you can find. The numbers of 1/1000, 1/10,000 or more still bother me. But how may 1/10,000 students are missed and never tested or adjusted for. In all its still just a best guess.