Looked back at your earlier post, referenced by PPs above, I see that there is a three SD difference between the GAI in the Very Superior range, and at least one representative subtest from each of the working memory and processing speed clusters, in the Average range but below the mean. (Can't tell if the whole WMI and PSI were calculated.) That is a pretty striking difference--big enough to make me suspect more than a typical gifted GAI/CPI split. Has your DS been assessed for anything beyond IQ? In order to make an informed judgement that 2e is not a likely explanation of the low WMI & PSI, you would need assessments of other areas, such as visual-motor skills (most likely in the context of an OT eval), auditory processing, and in-depth academic achievement (not a screening instrument like the WRAT-4), to name a few.
Based on what you've shared, there is insufficient data to determine one way or the other whether another exceptionality is involved, and some anecdotal information that suggests that there may be something not fully explainable by invoking age and LOG. You may wish to consider further assessment with someone who has 2e experience.
Good suggestion. DS was assessed by a psych with ample 2E experience. When deciding who to perform his assessment we researched. The psych we consulted has been published sufficiently that we could get a good idea of his background, he has written multiple articles on 2E, asynchrony and emotional needs. We are very comfortable that if additional testing to investigate the WM/PS scores were needed, he would have suggested them. He did do Woodcock Johnson Math testing. It showed he has an above average ability to perform paper and pencil math computations, but the score falls to below average when placed under timed conditions. He considered the possibility of a math LD, but felt it was more likely that DS has not been exposed to advanced math skills (that's a fact) and with exposure to advanced math skills his basic math skills would improve.
If this helps regarding WMI/PSI:
Digit Span - 9
Letter-Number Sequencing - 13
Arithmetic - 12
Coding - 9
Symbol Search - 14
