Kuvira's purpose was to help others, essentially, but her way of doing it was making herself the dominant provider and leader of everyone. This is a perfect example of that. She wants everyone to look to her as their leader, including the avatar.
The gaang! I swear if there is not an epic fight scene featuring old Zuko, Toph, and Katara against the bad guys I don't know why they made this show. <----- Well, Aang an Sokka are dead already so . also, is anyone else upset about gran-gran?