One question regarding the difference between the two:
Would 6w7 be more interested in creating a security system in the outside world in order to create a secure and peaceful mindset within.
While 6w5 perhaps is more likely not to bother with the external world as much. By focusing inwards security first, they'll create a secure external environment? Just how would this work with functions like Fe for example.
Guess ultimately the goal of most 6 is to create a good environment internally and externally. So I wouldn't be surprised if there were people who believed in both approaches... since they affect each other anyway.