Hmm, interesting way of looking at it. I don't think I'd go to far as to call instinct stackings "subtypes" in as much as they are simply other means of typing. But seeing instinct stackings working in tangent with types/IEs seems like a worthwhile analysis. It does seem like something that would help to eliminate stereotypes, although it could just as easily lead to creating even more hyper-specified stereotypes than before (the odds of which don't seem that likely, considering the number of types in play).