Can anyone comment on what value the extended norms might have where a child had a very spikey profile even without them (ie multiple 19s in one area and the rest of their testing more uniformly in the 120 sort of range)?

It's intriguing to know that one or more of those 19s might be 20/21/22 etc. I like the idea of more specific data. But what further conclusions might we draw? How specifically might we use this data?