I teamed up for Anacaona Black Snake's tomb, and ended up with 3 other people. We all entered the fight at the same time, but the boss only had one minion and no more minions were added, even thought it should have had 3 minions because there were 4 of us. Later I teamed up for Mozar Turtle Hunter's tomb with one other person, and there was still only one minion with the boss when there should have been 2. After that I teamed up for the Hall of Plumage with 2 other people and the boss had 3 minions like normal.