You are correct. He is primarily an auditory/kinesthetic learner.
I am so glad I had gotten him books on tape early on.
Yet, like me, he seems to get enormous frustration from not
being able to "display" what he knows in written format due
to problems reading. If you go by his age he is only delayed
by a two year level. But if you go by his IQ in other areas
the delay seems huge. The same thing happened with my
other child who is dyslexic. (Though she graduates from
George Fox with a BS in Biology this April, no DEBTS! due to scholarships,
and a 3.4 GPA) When I had her tested in 7nth grade she was
at the 99th percentile nationwide in math and science, BUT,
in spelling she was only at 12th percentile. One whole year
of intensive training only brought her up to the 24th percentile.
Gradually by the end of high school she was grade level
in spelling. Maybe I shouldn't worry. But I do. I guess
homeschooling, I may be more sensitive to how they perform.