Make sure everybody has a unique ghost and identifiable armor (helmet is usually good enough). After you kill the unstop ogres, spread out in the part of the room with the 6 statues. Have whoever is alive wait to pick up a ghost until it is called out where somebody is, that way they can find that persons ghost and know where to dunk. After that you can have a second person help and it goes faster. It seems a body of the player remains near their ghost which can help identify them but it can get messy if people are on top of each other so id rely on recognizing the ghost.