Four seats are avaliable for Assassins Creed Brotherhood. The Seat holders are:
Seat 1: DoctorEurope who has a collective score of 91k according to assassinsnetwork
Seat 2: WssxSupernova who has a collective score of 85k according to assassinsnetwork
Seat 3: MidLifeHighJack who has a collective score of 75k according to assassinsnetwork
Seat 4: Twiceborn10 who has a collective score of 70k according to assassinsnetwork
Changes to the seating can be made at any time and scores are based off of assassinsnetwork.ubi.com