Thank you for such a thorough and thoughtful response!
You hit the nail on the head with:
This is a profile that tends to be strong in abstraction, but not as strong in concrete skills, especially efficient work production.
DC has big ideas and is great a big picture thinking, but can't/won't produce.
Regarding the subtests, yes the evaluator questioned the validity since DC wouldn't participate past the first couple of questions. I think I might ask to have these retaken since DC has matured quite a bit since the testing.
Thanks again!