When you say "competitive mix of factions based on past event performance," and "3000 rankings per division," do you mean:

(1) The top 3000 teams will be in one division (based on past performance), top 3001 to 6000 in the next division.
**or**
(2) A random assortment in each division (for example, teams ranked #1, 5, 10, 15... 3655, 3660, 3665, etc in one team, and #2, 6, 11, 14... 3656, 3661, 3666, etc in another)