I largely agree with Albion in that the people who are more involved and more outgoing are naturally more popular. The person who shows up for the Sunday service and leaves the moment the last amen is said can hardly be surprised at being less popular than the person who attends more events and stays after the service to chat with people.
It can be a problem if people who are more popular end up wielding disproportionate influence but even then it's natural that the people who are more popular because of being more involved are more likely to have a bit of influence because they are, well, more involved in stuff. Whether it becomes a problem or not depends on how they use the influence.