It's good parenting to be aware of that sort of thing, but as you seem to guess I wouldn't worry too much. Kids are kind of just like that. I have a 13 yr old in my life right now and she is pretty similar, so I think it's healthy. The last thing we want to do as adults is make them feel small or like their thoughts and interests don't matter.

For what it's worth I don't mind talkers, it really is just about place/time/topic. I'm sure he'll make it through. I hear encouraging questions about others helps, "thank you for asking"/"what a great question" etc. but I don't know if it really helps so much as is something we do in the interim to feel like we're helping while they just mature in the background. Seems like you're on top of it though. Best of luck to you both!