Now, I'm totally confused as to why each member got their respective number and is participating on the Shadow Council side. Members: 1-6, 8, 10-12, are the ones participating. I assume Sarah is either 7 or 9, and she obviously would not participate.
3, 4, 6, 8, and 12. Team 1
1, 2, 5, 10, and 11. Team 2
Doesn't look like a strict magic level organizing element.