7 Year old aspergers emotion

Hi everyone. My 7 year old son was diagnosed with level 1 Autism. I had a feeling, but he still has some things that I consider normal, if not less likely to have Aspergers in the emotion department, if that makes any sense at all. As far as kids his own age goes, he cannot hold a conversation especially if its not a preferred topic. He can express excitment and anger, ( very well) but he also expresses like, sadness if he thinks he's in trouble by an adult. He could care less if a kid likes him, or even teases him, but god forbid an adult tells him to stop doing something he almost cries and starts stimming. Usually chews on something, or rocks (if hes able to sit down in the situation). I don't mean any offense by this at all, but this is new to me, and I feel like not much was explained. I was under the impression (again NO offense at all) that kids with Aspergers don't show much emotion? Especially with something like, shame I guess? He's obsessed with rules, and hates to see them broken by anyone, so maybe that has something to do with it? My best example is he's in Jiu Jitsu, and does fairly well despite his general awkwardness. But at times he gets overwhelmed by everything and he doesn't listen to some rules, and today he got confused and the coach told him to "please listen to the rules" and that's when he looked like he was going to cry and started stimming. 

I feel like I may be comparing him too much to other kids, and his cousin who is the same age but is severely autistic. I'm just still wrapping my head around him finally being diagnosed I guess. 

Thank you for anyone who listened to my rant here :)