Huh, that's a reeeaaally interesting way to sort out groups. I don't suppose you want to move to Tennessee and join our research lab? Mind if I take that thought, with proper credit obviously, to my next research meeting?
I think part of the issue is that couples researchers tend to look at individuals as a way of examining relationships, and therefore there's more value placed on data 'from the now', as it's seen as a better way of understanding how relationships function. However, it's not necessarily the best way to examine all the questions one might pose; I will cogitate deeply upon it!
Thank you very much for the suggestions!