LEGO has sent me an email with the follwing information:
Dear Builder,
Thanks for getting in touch with us. When it comes to Mixels, Flain tends to be the leader overall. However, the "specific" leader is not always clear, because the idea of Mixels is that they can all join together to create something that is much greater than the sum of its parts!
- This proves that 2.0 Mixels do not have leaders, and they follow the leader from the previous wave. I hope this info helps!