That's the map. You can actually farm stopper faster even tho there are only 4 mobs and these include voodoo and hoodoo, which doesn't drop stopper, cuz the drop rate is 3.5 times what it used to be, or say the drop rate is increased by 250% with the new source. 3.5 is calculated by taking the drop rate as stopper/all mobs killed. The actually drop rate is higher if hoodoo is taken out of the denominator.