Social success, of sorts

Well, here's another landmark for my son: He's finally found a social-skills group that will have him for a member. For years, I'd try to get him into groups like this one only to have the gatekeepers evaluate him and tell me, noooo, no no, no, he's not for us, leaving me to wonder what kind of social skills the kids in the group must possess that would still be needful of a group but would be so very superior to my distractible and impulsive but basically good-natured guy's. I guess he's grown into acceptability with time, because this weekend he participated in a group and the folks evaluating him felt he fit in fine. I could hear his voice wafting out to the waiting room from time to time, sounding perfectly friendly and comfortable. So now I have to wonder: Does the fact that his social skills are now good enough to allow him to be in a social-skills group mean that he no longer needs to be in one?