I have noticed this cluster type thing you are talking about but have not been able to come up with a clear understanding of it.. lately I have been thinking it may just be some enneagram type, instinctual stacking and health level combo.. not sure though. I would like to look into it more but I wouldnt want to be the one to go weeding through all the threads of what's my type. I'll read it if you decide to do it cause I think its an intersting idea.