I think Shikamaru's been here a lot and gets involved with the stuff the grown-ups do. You know, like the doors that are locked and missions and stuff. So...he talks to people a lot. And Lee talks to everyone 'cause he's really super friendly, and Chouji's really friendly too. Some of the other ones I've met are more secretive but I think they're all pretty much really nice.

So, I think you're right!! They're just more talkative and friendly probably!