Think of the way they have been placing mobs.. you don't see that much variety in small areas until you branch out so this sort of makes sense.. I mean if your in an ixali camp your about to get jumped to put it bluntly.. and if your in first area outside of grid your going to get jumped by squirrels.. I think the only issue that will arise from this is the AoE of the actual call, not so much the monster groups.