I realize that you meant lower than their other scores, but I would still question whether most GT kids have lower PSI and working memory scores. Personally I don't believe that. I think that you hear that a lot online because parents tend to worry when some index is lower than the others. I don't think it's uncommon, but I doubt that it's most.
I would not be surprised, however, to see kids with higher memory and speed scores doing very well in school. Memory and speed are certainly valuable skills in an academic context.
