I made it mainly for fears and cc... they will automatically regroup with whoever you choose

You can choose to follow leader, or follow anyone thats in your party. (will only broadcast to your characters in your party when you join bg as a group, even if they are in a different bracket it will work)

One addon I used only followed the leader, and that made it difficult to manage in BG.

With KeepFollowing, if they stop following... and get back in range, or are in range... they will "KeepFollowing"