Another question.

Once I am past this meeting I hopefully won't have so many questions. And now I found out my DH can't attend, so I'm even more worried (I tend to get very tongue tied under stress).
I have a meeting with my DS's teacher and principal on Thursday and in speaking with my good friend (who works in education and has a masters in psychology) a very obvious roadblock popped up.
My son's WISC FSIQ is 136 but his GAI is 144. His comprehension subtest was low (compared to the other subtests in that area) and his working memory and processing speed were only in the high average category. My very well intentioned friend said "well, he is gifted, but it really isn't that stunning of a score, particularly in our school district." She is right in that our district is a very educated and high achieving demographic.
I am going to push for a 1-2 year subject acceleration in math (his SCAT percentiles - he is a 2nd grader so he is being compared to 4th graders, were 97% quant. and 88% in verbal) and hopefully some additional differentiation.
So, how do I explain that the GAI is a better indicator compared to FSIQ. I am very confident someone is going to say in the meeting - "well, he is moderately gifted but it isn't really that high of a score and he will be fine with enrichment once it starts in 4th grade." It isn't that I think he is PG, but I do think his GAI at 99.8% is a far better indicator of his abilities (esp. after seeing his SCAT scores) compared to his 99% FSIQ. And his SCAT scores are after basically not learning anything in school this year - if he was homeschooled I would guess he would have substantially more mastery.
Any suggestions?
Cat