pdb1:
Jimbog1964: At TL there is no new tier to reach after saturation, and so the average becomes only the average of the best 500 counting rounds.
Are you sure about that ?
Yes we are. Also, the plummeting is common to all tiers. While filling the saturation spots, there are some high scores included. When they are pushed out after saturation, the big difference between old and new commands a big change in average - plummeting ;)