He tends to be on the lower side of average for articulation, but keeping up. His grammar seems delayed to me, but I'm used to a highly verbal PG child and his teacher and SLP seem to think it's normal. He just has a few problems with unusual tense constructions. He can have a complex conversation with us; he gets fewer opportunities to do so with his teacher so I can't tell if she would see anything unusual in his speech. I think I will ask her to try having a longer conversation with him at some point to get some feedback. When I picked him up after his pre-kindergarten screening at the school, the tester came over to me to tell me how impressed she was at his verbal ability (his vocabulary and knowledge of sight words). I don't think that most people actually take the time to have a longer conversation, though, and that might make issues more obvious.
I would keep track of the speech quirks -- make note of what he says and the situation, including time and date.
When he was "fully graduated" was that based on the original diagnoses, or was that with further investigation? There are some speech evals that aren't normed until 6 or 7.
Teacher of the year -- even if you don't have an award like that, I've gotten into the habit of writing a thank you note to the principal delineating exactly what it was about the teacher that really served my kids well. I keep all negatives out of the letter. It's 100% positive. In the day and age of "value added" teaching evaluations and such, I figure these are more beneficial in the long run to the teacher. Also, by writing out in a 100% positive manner what worked for my kid, I've found that my kids are more likely to be similarly well placed in the future.