Tester was confident it is a LD...i still wonder if underachievement could just be lack of exposure...
If you'd listed even scores across the board on the WISC and it was only a dip in achievement test scores, I'd wonder the same thing - but the dip in processing speed on the WISC was quite large. I would also trust the observations of the psych who test your ds unless you have a reason not to.
I'm not sure if you're worried about the possibility of own LD? Try not to over-worry about it if it's troubling you. If there is an LD, you'll be so glad that you recognized it now rather than a few years down tithe road.
Best wishes,
polarbear