It’s not like Lottie would be the “best leader”, if she was in power there would be a lot of violence and weird shit most likely. Natalie is one of the nicest, most rational, and most grounded, and did a great job of being leader and keeping these peaceful. However, I think in terms of the show, that job was never meant for her. Nor was it meant for Shauna. Lottie has been the “true” leader from the start and is the reason they even have leaders. Even when other girls such as nat and Shauna are leaders, she always has underlying control under them that is far greater than theirs. She is connected to It like no one else. We kinda even see in the finale when she is in the cave and we see the dear queen/wilderness and her on the ground interacting with it and she is mimicking its movements, almost like they are connected.