We have a 30 yr dude like that here except he just goes to one group.He "rules it with a fist of iron" we say.The membership is on the decline too.
There's a couple guys like that around here who took over the group I got sober in. A lot of people depended on that group, which has been around for decades, and it eventually got so unbearable that everyone but these few guys left. The group is down to about six people (so I hear), who sit around and listen to themselves.
The interesting thing is that the people who depended on that group now realize that they just stood by and let it happen, not realizing until it was too late. So this was a good early lesson for me to attend business meetings and speak my mind.
But it also gave me hope, since another group sprang up just across the street, holding meetings on the very same nights as the original. So the group is "back", just across the street.
M